clean up Sources

plug memleak in case of failed files.
don't allocate part combine events statically. Plugs small leak.
ignore gcstat files.
don't delete .scale.pfa; the FF script may not have read themyet. Fixes brace OTF bug
more ignores.
Remove set-part-combine-listener. This plugs a memory leak.
clear lexer scopes after parsing file. Plugs pseudo memory leak
set-part-combine fix for autochange.
implement and use ASSERT_LIVE_IS_ALLOWED()
autochange thinko.