Log Message:
rtptools: located new home on Github. Update to 1.22.

1.22 (July 2018)
Add man pages.
Change license to 3-clause BSD.
Replace typedef unsigned char u_int8 etc with stdint.h types.
Update to new autotools.
Generate html versions from man pages.
Reflect the manpages in the homepage.
Fix recvmsg() on Solaris.
Detect clang for compiling.
Fix generating a rpm package.
Fix building on Windows.