[PATCH, gfortran] Add BYTE type

[FX Coudert]

> This patch adds a BYTE type to gfortran (enabled by -fbyte-type). This 
> is just treated as an INTEGER(1), and is for compatibility with old 
> non-standard Fortran codes.  (This type is enabled by default in ifort, 
> pgf90, and xlf90.)

I have the few following comments (in decreasing order of importance):

   * BYTE is supported by g77; so I think we shouldn't add a special 
-fbyte-type but include it by default as GFC_STD_GNU or GFC_STD_LEGACY.

   * You should add another testcase byte_2.f90, compiled with strict 
standard conformance, to check the error messages issued.

   * The name for the testcase should be byte_1.f90 (that's the usual 
naming convention).

Otherwise, the patch looks fine. Once these comments are addressed (and 
other gfortran developpers have had time to give their opinion on the 
first point), please submit a revised patch.

Thanks for your help,
FX