say hello to mkfloatlib

MKFloatLib will house all the floating point eccentricities, hiding some
floating point hacks from the kind-of-sort-of-but-not-really userland
code, i.e. my other algorithms. This should unify the programs and allow
for minimum ad-hoc error reducing hacks.
added some mkmatrix typedef macros
implemented row pivoting
added small gauss-elim tester for prototyping
added cmake bindings for t_mkgausselim test compiling