introduce iom_put and the use of the new ioserver

[smasson]

First implementation of iom_put (new way to manage output files)

• add key_ioserver: nothing is changed if this key is not used. When the key is used, we output data twice: (1) in the old files (2) in the new file using ioserver. We do this only to facilitate the validation of the new outputs. We will, of course, remove the old files when key_ioserver is used in a new future.
  
• new outputs are controled by an ​xmlfile

[smasson]

done, see changeset:1359

[anonymous]

Milestone 2009 Stream 1: User Interfaces deleted