Autoconf: Cosmetical, crypt(3) is a format, not a mode!
Removed PLUGFORMATS_SRCS from makefile.  This was a legacy requirement for knowing when to make fmt_structs.h headers.  Now we do this in configure, so this variable is totally unused (and HUGE).  This is cleanup
Better information given for buffer over/under flow issues.  If block listed as not being freed, then a memory dump (some of the start and some of the tail of buffer) will be output. This helps track down just WHAT was the problem, and is helpful, especially when a COMMON allocation function was where the data was allocated.
rexgen is now disabled by default.  If the user wants it, and has a working version, then --enable-rexgen is required to get it used