#2 Should build with F90 if available

[Patrick Miller]

LBL's Cray T3E prefers to build with a stable FORTRAN
90 compiler. It may simply be reasonable to check to
see if F77 is well behaved and use it (trying for
F90 if it doesn't exist).

Note: When the foriegn interfaces work is up and running,
I will simply detect the full set of languages
(C, C++, Python, F77, F90) and build interface plug-ins
for each.