Fixed (or workarounded) problems compiling on MacOsX 10.9.3 with:

- clang

- gcc (still one should add -Wno-delete-non-virtual-dtor for SpFold and SpReso but cannot be put on CFLAGSSB since is valid for g++ but not for gcc, and gcc/g++ complains [and with -Werror also stops...] about it.

Some workaround (-Wno-something) still needed to cope with new or still present warning
Restored right behaviour (even if never happening...) in AntiPG