rm-logfiles

Moved well_ord_Memrel, lt_eq_pred, Ord_iso_implies_eq_lemma,
Ord_iso_implies_eq to top of file, as they do not require the other
material. Simplified proof of ordertype_subset.

Proved ordertype_eq: a short proof using deepen_tac! Deleted
bij_ordermap_vimage and ordermap_Memrel
"bij_ordermap_vimage and ordermap_Memrelf. [| f: bij(A,B); well_ord(B,r); x:A |] ==>\
\ ordermap(A,rvimage(A,f,r)) ` x = ordermap(B,r) ` (f`x)";
"\ ordermap(A,rvimage(A,f,r)) ` x = ordermap(B,r) ` (f`x)";i. [| Ord(i); j:i |] ==> ordermap(i,Memrel(i)) ` j = j"
because ordertype_eq serves the same purpose. Proofs of bij_ordertype_vimage
and ordertype_Memrel are now trivial.

#! /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 {} \;