[Patch, Fortran] Add RANK intrinsic of TR 29113

[Tobias Burnus]

This patch adds the rank intrinsic of the TR 29113 draft. It is a bit 
boring until gfortran supports DIMENSION(..) ;-)

Build and regtested on x86-64-linux.
OK for the trunk?

Tobias

PS: The current draft of TR 29113 is available at 
http://j3-fortran.org/pipermail/interop-tr/2011-May/000710.html (version 
of Monday, 16 May)
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