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'''Author''' : Matt Martin 

'''ticket''' : #1468

'''Branch''' : [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5072_UKMO2_OBS_simplification       dev_r5072_UKMO2_OBS_simplification  ] 
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=== Description ===

To simplify the observation operator code and namelist in NEMO to make it easier to use and to develop. Top level parts of the OBS code will be re-written. Lower level routines will remain as they are for the time being unless obvious changes can be made to simplify the code. Input formats will be restricted to the fdbk format (tools are provided to convert from some standard formats to the fdbk format). The namelist will be simplified and obsolete options removed.

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=== Testing ===
Testing could consider (where appropriate) other configurations in addition to NVTK].

||NVTK Tested||!'''YES/NO!'''||
||Other model configurations||!'''YES/NO!'''||
||Processor configurations tested||[ Enter processor configs tested here ]||
||If adding new functionality please confirm that the [[BR]]New code doesn't change results when it is switched off [[BR]]and !''works!'' when switched on||!'''YES/NO/NA!'''||

(Answering UNSURE is likely to generate further questions from reviewers.)

'Please add further summary details here'

 * Processor configurations tested
 * etc----

=== Bit Comparability ===
||Does this change preserve answers in your tested standard configurations (to the last bit) ?||!'''YES/NO !'''||
||Does this change bit compare across various processor configurations. (1xM, Nx1 and MxN are recommended)||!'''YES/NO!'''||
||Is this change expected to preserve answers in all possible model configurations?||!'''YES/NO!'''||
||Is this change expected to preserve all diagnostics? [[BR]]!,,!''Preserving answers in model runs does not necessarily imply preserved diagnostics. !''||!'''YES/NO!'''||

If you answered !'''NO!''' to any of the above, please provide further details:

 * Which routine(s) are causing the difference?
 * Why the changes are not protected by a logical switch or new section-version
 * What is needed to achieve regression with the previous model release (e.g. a regression branch, hand-edits etc). If this is not possible, explain why not.
 * What do you expect to see occur in the test harness jobs?
 * Which diagnostics have you altered and why have they changed?Please add details here........

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=== System Changes ===
||Does your change alter namelists?||!'''YES/NO !'''||
||Does your change require a change in compiler options?||!'''YES/NO !'''||

If any of these apply, please document the changes required here.......

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=== Resources ===
!''Please !''summarize!'' any changes in runtime or memory use caused by this change......!''

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=== IPR issues ===
||Has the code been wholly (100%) produced by NEMO developers staff working exclusively on NEMO?||!'''YES/ NO !'''||

If No:

 * Identify the collaboration agreement details
 * Ensure the code routine header is in accordance with the agreement, (Copyright/Redistribution etc).Add further details here if required..........