Enables the compile tests in Fortran/gfortran/regression. These were the last remaining tests that had not been enabled.
As with the other tests, failing tests have been disabled and categorized based on the reason for the failure. Where possible, the particular error that caused their failure has been documented. In some cases, a potential reason for the failure has also been provided.
The list of disabled tests has been reorganized slightly to enable some grouping by category and alphabet.