[Patch,Fortran,4.6] Coarray 7/n - add -fcoarray=<none|single>

[Tobias Burnus]

This patch is rather simple compared with the others and justs add a new
compiler flag: -fcoarray=... with the options "none" (which is default)
and "single".

With "none" - the default -, the compiler gives an error message when
encountering a coarray declaration or an image control statement. This
gives the user a hint that the program uses coarrays; this helps to
reduce the change of running into the following problems:
(a) using a single image for programs which expects, e.g., at least two
images (this is the usage case which Nick mentioned)
(b) compiling one file with single-image support and the other one with
full, library-based coarray support, which can easily happen but leads
obviously to wrong code.

(Additionally, the -fcoarray= argument would have been added anyway for
the real parallel version.)

Build and regtested on x86-64-linux.
OK for the 4.6 trunk?

Tobias
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