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version1.gms : How to test for a GAMS version

As new features are added to the gams system, one may want
to write GAMS code that adjusts to what version it is running
under. The GAMS language processor has an integer version ID,
whereas the GAMS releases are numbered with a string that can
interpreted as a floating point number.

GAMS release     GAMS version
22.5             148            2007-04-01
22.4             147            2007-02-14
22.3             146            2006-11-27
22.2             145            2006-04-21
22.1             144            2006-03-15
22.0             143            2005-08-01
....

1. 1995-09-28 the following features were introduced (GAMS version 86):

   $version nnn     will issue a compilation error if nnn is less than the
                    current GAMS version
   %system.version% will be replace with 'GAMS Rev nnn' where nnn is the
                    current GAMS version
   system.version   can be used on put without %% and ''

2. 2006-04-21 GAMS release 22.2 (GAMS version 145) added the following features:

   %system.GamsVersion%         will be replace with the current GAMS version 'nnn'
   GamsVersion                  is a new function that will return nnn
   $if GamsVersion mmm command  will execute command if the current GAMS version
                                is greater or equal to nnn, this is similar to
                                the $if errorlevel nnn

3. 2007-04-1 GAMS release 22.5 (GAMS version 148) added access to the GAMS release number:

   %system.GamsRelease%  will be replace with the current GAMS release 'mm.n'
   GamsRelease           is a new function that will return mm.n

• GAMS Development Corporation, Formulation and Language Example.