[Patch, Fortran] More coarray fixes

[Tobias Burnus]

The test case of this patch requires the trans*.c changes of 
https://gcc.gnu.org/ml/gcc-patches/2014-06/msg01662.html

At least for "coarray(:)[i] = coarray2(:)[j]" the library must handle 
string padding/trimming (previously implemented) and numeric-type and 
character-kind conversion. And instead of generating a temporary array 
for those in the compiler for the assignment case, I now also push the 
type conversion task always to the library.

The attached patch case implements the character-kind conversion and the 
numeric type conversion, it adds an extensive test case for the 
character handling. On the compiler side:
- resolve.c: We avoid a temporary for "var = caf[i]" and transform it 
into "caf_send(var, caf[i])"; however, this patch avoids this for "array 
= scalar_caf[i]" – leaving it to the normal code path (temporary + 
scalarizer)
- trans-intrinsic.c: If we assign a scalar (caf_send), there is no 
reason not to do the numeric type conversion in the compiler. Thus, this 
patch now does so. (Well, only if the RHS is neither a string nor coindexed)

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

Tobias

PS: The follow up patch(es) will add a test case for numeric type 
conversion and handle (and test) vector subscripts in the library. 
Afterward, I want to look into some issues with polymorphic coarrays; 
some are pre-existing, but I have the feeling the trunk port might have 
regressed compared with the fortran-caf version in some corner cases.
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