move tools into own dir under src/
print_version() using git describe --tags
update configure.ac
move cnrun into own dir under src/, too, optimise Makefile.am's
include "config.h" conditionally
tidy up odd insignificant bits
include lib*/*.h relying on newly added -I$(top_src_dir)/src
top Makefile.am: list ChangeLog, autogen.sh etc in proper EXTRA_DIST