Modified proofs for (q)split, fst, snd for new
definitions. The rule f(q)splitE is now called (q)splitE and is weaker than
before. The rule '(q)split' is now a meta-equality; this required modifying
all proofs involving e.g. split RS trans.
#! /bin/sh
#rm-logfiles: remove useless files from subdirectories
rm log */make*.log */make*.log.gz
rm */test
find . -name '.*.thy.ML' -print -exec rm {} \;