#3 - Update setting of variables version and tag

[mlee03]

In this PR,

changes have been made to the variables tag and file_version. The variable tag has been removed. Declaration of the variable file_version has been moved to a newly created file_version.fh file and is set to a default value of unknown. With these changes,

call fms_write_version_number(version,tag)

in _subroutine couplerinit has been changed to

call fms_write_version_number('FULL_COUPLER_MOD', version)

Note the change in the ordering of arguments, i.e. version now as the second argument, has been made to be consistent with modules in FMS.

Output from write_version_number in logfile.out is now changed from

$Id$
$Name

to

FULL_COUPLER_MOD
unknown

This PR depends on #104 and #106

[thomas-robinson]

@rem1776 wait for 2a to be merged before merging this.