Disable Fortran 77 support in Cactus

[Erik Schnetter]

There are no "Fortran 77" compilers any more. Cactus currently distinguishes between FCODE and F90CODE (pure Fortran 77, and Fortran 90). The pure Fortran 77 code has less argument checking etc. and is less safe, and is not needed any more. It should be removed, both from the makefile system as well as from the CST that auto-generates code.

Keyword:

[Frank Löffler]

I am in favour. All F77 macros should probably remain, point to the respective F macros (not to F90, even if that would be the same), and be marked as deprecated.

[Erik Schnetter]

I am leaving this ticket as "reviewed ok". This change will probably require multiple changes, removing the functionality piece by piece, while keeping backward compatibility.

[Ian Hinder]

Review state removed because there is nothing yet to commit.

[Ian Hinder]

It looks like this was implemented and committed already to master in https://bitbucket.org/cactuscode/cactus/commits/e8f2db41cd59986b256d282c57557daed035d4b6, and this may have caused a regression when no Fortran compiler is available (see #2099).

[Roland Haas]

The regression that @ianhinder reported on has been fixed and all F77 code seems gone.