Partial implementation of highlevel ring wrappers
Check mutablility in Func_SI_SetMatElm.
Merge branch 'master' of https://github.com/gap-system/libsing
Fix typo
Do not #include kernel/syz.h anymore
autogen.sh: error out if autoconf/automake missing
Improve fetchsingular script
Tweak INSTALL file
Add _SI_LIBSING_LOADED canary to prevent loading the module twice
Move SI_Undef out of tests, make it a "normal" helper function.
Fix error message when invoking _SI_SetMatElm on immutable matrix
tests: output which test file is being run