cleanup of configure.ac
configure mechanism for timing stuff
highrestimer now possibly mach compatible - needs some testing
update
update2
more compatibility tweaks - checking for argp
added libbfd check
added libbfd check (2)
removed redundant logic
grapes is now a convenience library, pulled in md5 stuff from grapes, still stubbed
proper check for which md5 implementation to use - supporting openssl/md5.h and bsd/md5.h
added changelog entry
reduced autoconf version requirement to 2.68 for Ubuntu 12.04 LTS support
improving an error message