Fix xalloc installing
Fix: header is necessary for distribution
fix: version numbers, removed S_VERSION1
fix: renmaed man page: singular.1 -> Singular.1
Replaced "readlink -f" with shell code (due to Mac OS X)
Avoid crashing via __builtin_frame_address(3+) on Mac OS X
Only test once (no more dynamic AND static tests)

chg: also BS cleanup
Link main Singular executables without -static by default
add: man pages for ESingular, TSingular
fix: enable omGetBackTrace again (for intel-linux)
Renamed NDEBUG -> SING_NDEBUG in order to avoid confusion with GCC macro
Added '--cflagswithdebug' option for *-config scripts (for more debug/asserts/checks)
Show more building flags in versionString (-v)
Fixed lib*-config scripts
Use @prefix@, @includedir@ and @libdir@ in lib*-config scripts

NOTE: user should do: configure --prefix=FIXED_PATH and make install
Added FLINT flags to lib*-config scripts
Fixed lib*-config

NOTE: libdir needs exec_prefix by default
Commented out obsolete 'initializeGMP'
chg: activate ehv.lib
chg: disable omInitGetBackTrace/omGetBackTrace if __OPTIMIZE__ is defined