patch(es) to date for fortran-experiments

[Christopher D. Rickett]

hi all,

i attached another patch, which actually contains the previous patches
i've sent out.  i thought it might be easier to look at the most recent,
but if it's easier for the reviewer, i can go through the diff and remove
what i've already submitted.

the basic descriptions:
- the bugs listed for bind(c) variables on the wiki should now be handled
correctly.
- the bug for validating C interoperable kinds (also on the wiki) should
be fixed.
- error checking is done to make sure bind(c) variables are only at the
module-level scope, unless they're common blocks.
- parsing bug for bind(c) attribute should be fixed.
- test cases for the fixed bugs.  more test cases to come, once i fix the
dg-error syntax.

hope the patch helps.  let me know if i need to remove the previous
patches from this diff.  thanks.

Chris
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