PJ: delete cryptography routines.
PJ: sluff largest_frag.
PJ: add CMake file for util.
PJ: fix prototypes and unused variables.
PJ: add replacement ultoa.
PJ: fix signed/unsigned mismatches and casts.
PJ: make assignments in conditionals more explicit.
PJ: suppress empty body warning.
PJ: fix empty body if statement.
PJ: fix var args.