[Cppqed-support] clang compiler support

[Andras V. <and...@ui...>]

Hi,

After some time, today I tried again to compile the framework with the
clang compiler. What I experience is that clang ...

* ... can mostly compile the BlitzCVS_compatibility branch, except for
an error inside FLENS which used to be there at the time of my earlier
tries as well. Therefore, I patched FLENS, so that clang compiles most
of this branch, except for a few scripts.

* ... cannot compile main-branch C++QED because of some error it finds
inside blitz++. So, what I did was to patch Blitz as well.

As last time, clang again noticed some funny little mistakes that gcc
does accept. These mistakes have been corrected, I will push the
update tomorrow.

Best regards,
András