Changed to using correct versions of expf and caching the result; unsure if this is correct still, though

enabled python2/3 cross-compatibility for the unit tests by including parentheses on the print calls

Added fno-builtin-memcmp to the testSymmetry test as this was causing some problems with clang 4.x (Apple LLVM 9.1.x)

TODO: Docs; actually getting the system working.