fix thread safety tests run under debug build
silence warning enabled by default in recent GCC
quote $QHOME in case of spaces
use -static-libgcc on Windows
q console doesn't work in Cygwin
increase constraint tolerance for Windows
add latest version text
use checked r0() in all instances
convert () to 0#0. in conmin parameters as "f"$ would
fix crash in square matrix functions when called with inappropriate type
add version text
fixed version number