Revised compile script to fetch selected files from PJSIP SVN trunk

- Revised compile script to behave better when fetching/patching
- Hardcoded fetching from 1.0 branch in setup script, removed
  --pjsip-svn-repo option
- Have sip_inv.c and certain dependecies updated from specified versions
  in trunk
- Removed patch that removes transaction when receving a negative reply
  to a re-INVITE, is integrated into PJSIP SVN trunk
- Compiling offline with --pjsip-clean-compile is no longer possible

NOTE: Please perform "python setup.py build_ext --pjsip-clean-compile"
      for best results.

darcs-hash:20090504140325-58103-edd2828002adb9f046200e425a7ab1a2a28fdde5
Added PJSIP patch to cancel SDP negotation on negative reply to re-INVITE

Uses Benny's patch previously recorded.
NOTE: Again, do "python setup.py build_ext --pjsip-clean-compile"

darcs-hash:20090504160844-58103-23bcab902a538ab93a9bd09a36145bfbfed5c333