added a README.txt with the original src notes plus lots of guidelines for installing, contributing, etc.

*removed qt from autobuilds since qt5 is not standard in Ubuntu 12.04 and besides we need to update control files as well as online documentation

*improved installer to make it easier to recompile pd-l2ork when continuing development after building a snapshot deb or tarball installer (the pd folder will retain config script with the appropriate --prefix flag)

*updated most of the audio API to the latest version (with the exception of ALSA and JACK which are partial until our improvements can be merged and/or new implementation of JACK thoroughly tested to ensure we like its default behavior)

*removed text editor since now pd-l2ork's facility for editing text inside object boxes is adequate enough not to require a full-fledged editor

Patch put on tracker for Pd-extended, but I thought I'd go ahead and commit here, too