CLIPS 6.30 includes some important performance optimization, as Gary explains here.
I created a patch that allows PyCLIPS to support CLIPS 6.30 in addition to previous versions.
Unit tests pass on 6.24 and 6.30, Linux and Mac. I changed a few tests that did not pass due to new garbage collection behavior in 6.30.
Please find attached the patch together with the (current) clips 6.30 source file. If you decide to accept this patch, please add the 6.30 source archive to the PyCLIPS website next to the 6.24 one (e.g., http://pyclips.sourceforge.net/files/CLIPSSrc-6.30.zip). The patch includes an option to select the CLIPS source download URL (in a file, CLIPSSrc.url).