More warning remediation

GCC doesn't show any warnings even with "-Wall -Wextra" anymore

VC is warning free at /W2, but it does complain about insecure strcpy, strcat, strtok etc. at /W3 and /W4

Open Watcom C32 1.9 doesn't show any warnings at the moment

TODO: check for warnings on OS X LLVM/Clang 3.2