* yorick: add haveUDUNITS()
* make sure the check suite passes even without UDUNITS
ensure Gyoto builds and make check works even without xerces.
repair support building and checking without cfitsio
repair building *with* cfitsio (!)
fix many pedantic warnings (--enable-hardening)
more pedantic warnings
Merge branch 'master' of github-paumard:gyoto/Gyoto