Build fixes and long/int unsigned/signed weirdness fixes
Near working support for the distributed audio encoding.
merge change of MAIN branch to revision 1.18
merge change of MAIN branch to revision 1.93
add generated files.
follow mjpeg_logging API change, not pass "\n". eliminate some gcc warnings.
small fix logic of search frame to drop, last to release 1.6.
enable make targets: dist, distcheck, maintainer-clean.
Small fix to enable deinterlacing on interlaced inputs for lav2mpeg
General build fixes
