When FreeBSD gets a stdint.h, change the conditionally-compiled
inttypes.h inclusion in hashtbl.c to stdint.h.

find out about possible bug in FreeBSD's readdir_r and change
conditionally compiled readdir back to readdir_r.

add configure option to compile in the DTD for the XML output.

PROGNAME (with elcerror) doesn't work for aux programs

maybe change recursive organization of base/aux to flat organization
where the base Makefile builds and installs aux.

add manpages for auxiliary programs

