More free()s around

This should take out all memory leak detections except for file handlers (which I don't know how to handle in case or error) from cppcheck, don't know about Coverity.
Also some minor changes (put my real name in the contributor list because I'm not THAT hipster)

CPPCHECK test: https://padrepio.in/richelieu/Hamcha/OlegDB/feature/HOT_TREES

Compiles but test hangs (like they always do) on FreeBSD 10.0.
With SPLAY_TREES disabled they all pass (except for test_can_find_all_nodes which requires them enabled)