ZZ will become a reserved name
compatibility with intmat/intvec
avoid (version) output of 4ti2
removed duplicate entries from some test lists
div instead of / for int/bigint
more removed/fixed tests
Update Doxygen config
Doxygen Singular-colors + Logo
Better Doxygen docu
fix: possible segfault in GCD when passing to extensions
fix: possible segfault when passing to extensions in sparse gcd
chg: added pruning of alg extensions