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    Define IGCM_sys functions that are common on every systems

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function IGCM_sys_RshMaster
* Purpose: Connection to frontend machine.
* Examples:

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function IGCM_sys_RshPost
* Purpose: Post-process rsh command
* Examples:

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function IGCM_sys_SendMail
* Purpose: Send mail when simulation is over
* Examples:

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function IGCM_sys_Mkdir
* Purpose: Master locale mkdir command
* Examples:

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function IGCM_sys_MkdirWork
* Purpose: Mkdir on Work
* Examples:

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function IGCM_sys_Cd
* Purpose: master cd command
* Examples:

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function IGCM_sys_Chmod
* Purpose: Chmod
* Examples:

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function IGCM_sys_FileSize
* Purpose: Filesize
* Examples:

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function IGCM_sys_TestDir
* Purpose: Test Directory that must exists
* Examples:

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function IGCM_sys_TestFileBuffer
* Purpose: Test file that must NOT EXISTS on Buffer
* Examples:

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function IGCM_sys_CountFileBuffer
* Purpose: Count files on Scratch filesystem
* Examples:

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function IGCM_sys_Tar
* Purpose: master tar command
* Examples:

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function IGCM_sys_UnTar
* Purpose: master un-tar command
* Examples:

*************************
 File transfer functions
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function IGCM_sys_Rsync_out
* Purpose: treat return val of rsync
* Examples: IGCM_sys_Rsync_out out_RET_rsync
  Error values and explanations can depend on your system version.
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function IGCM_sys_Miror_libIGCM
* Purpose: Mirror libIGCM PATH and lib to frontend
* Examples:

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function IGCM_sys_Cp
* Purpose: generic cp
* Examples:

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function IGCM_sys_Rm
* Purpose: generic rm
* Examples:

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function IGCM_sys_Mv
* Purpose: generic move
* Examples:

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function IGCM_sys_Get_Master
* Purpose: Copy a complete directory from MASTER filesystem
* Examples:

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function IGCM_sys_PutBuffer_Rest
* Purpose: Put computied restarts on ${SCRATCHDIR}.
           File and target directory must exist.
* Examples:

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function IGCM_sys_PrepareTaredRestart
* Purpose: Prepare tared restart to be access by computing job.
* Examples:

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function IGCM_sys_PutBuffer_Out
* Purpose: Copy a file on the buffer filesystem after having chmod it in readonly
* Examples:

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function IGCM_sys_GetBuffer
* Purpose: Get a file from ${SCRATCHDIR}
* Examples: IGCM_sys_GetBuffer myfile /destpath/myfile_with_PREFIX
            IGCM_sys_GetBuffer /l Array_contain_myfiles /destpath/
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function IGCM_sys_GetDate_FichWork
* Purpose: donne la date filesys d'un fichier sur le filesystem WORK
* Examples:

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function IGCM_sys_rebuild
* Purpose: rebuild parallel files
* Examples:

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function IGCM_sys_rebuild_station
* Purpose: rebuild parallel files describing station
* Examples:

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function IGCM_sys_ncap2
* Purpose: encapsulate ncap2 call so as to manage error code and retry
* Examples:

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function IGCM_sys_ncatted
* Purpose: encapsulate ncatted call so as to manage error code and retry
* Examples:

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function IGCM_sys_ncbo
* Purpose: encapsulate ncbo call so as to manage error code and retry
* Examples:

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function IGCM_sys_ncdif
* Purpose: encapsulate ncdiff call so as to manage error code and retry
* Examples:

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function IGCM_sys_ncea
* Purpose: encapsulate ncea call so as to manage error code and retry
* Examples:

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function IGCM_sys_ncecat
* Purpose: encapsulate ncecat call so as to manage error code and retry
* Examples:

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function IGCM_sys_ncflint
* Purpose: encapsulate ncflint call so as to manage error code and retry
* Examples:

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function IGCM_sys_ncks
* Purpose: encapsulate ncks call so as to manage error code and retry
* Examples:

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function IGCM_sys_ncpdq
* Purpose: encapsulate ncpdq call so as to manage error code and retry
* Examples:

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function IGCM_sys_ncra
* Purpose: encapsulate ncra call so as to manage error code and retry
* Examples:

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function IGCM_sys_ncrcat
* Purpose: encapsulate ncrcat call so as to manage error code and retry
* Examples:

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function IGCM_sys_ncrename
* Purpose: encapsulate ncrename call so as to manage error code and retry
* Examples:

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function IGCM_sys_ncwa
* Purpose: encapsulate ncwa call so as to manage error code and retry
* Examples:

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function IGCM_sys_cdo
* Purpose: encapsulate cdo call so as to manage error code and retry
* Examples: