Minor release. Only build environment is changed. No code changes.

Configure script improvements: Actually does something with more
of the previously defined tests.

Added --enable-strict to configure script to enable strict error
and warning checking during compilation (off by default).

--enable-silent-rules is now on by default. Can be disabled with
--disable-silent-rules.

Future work needed to substitute getopt_long on systems that do
not have it in libc.

Future work needed to deal with other failing tests.

Corrected git URL in man page.

Removed PDF man pages from distribution. The key tables didn't
format correctly, anyway. They can still be generated by "make
pdfman" if desired.

Added hagelin(1) man page to give overview of project.