Corrections and Amendments to the Fortran "filetype" files

Several keywords such as ```concurrent```, and those pertaining to coarrays were not present in ```filetypes.fortran```; nor were a whole host of new intrinsic functions, e.g. bitwise comparisons and Bessel functions.

I used my copy of Metcalf & Reid's "Modern Fortran Explained" to ensure that the lists included *all* those which are considered valid by the current language standard, namely Fortran 2008.

Doing this has accentuated a minor deficiency in Scintilla's Fortran lexer. There are a few tokens in Fortran which are valid either as a keyword or as a function/subroutine.

* ```real``` is used either to denote/declare a variable of type(real), or as a function to cast its input into type(real)
* ```all``` is used either to perform some logical comparison against all elements of an array-valued input, or as part of a directive such as ```sync all``` (in that case, for coarrays)

Scintilla, and therefore Geany, will *always* regard these words as keywords, purely and simply because the "keywords" list occurs before either of the "functions" lists, and there is no conditional logic. I may file a feature request over at Scintilla.

I also removed a garbage word from the ```.fortran``` and ```.f77``` files, which was simply two valid keywords accidentally concatenated; presumably during a past commit in which new keywords were added in its vicinity.