reintegrated new lambda calculus

git-svn-id: http://gapt.googlecode.com/svn/trunk/source@2070 85d21ef8-add0-11de-ae77-5bfb9c5a3f34
added hol export

git-svn-id: http://gapt.googlecode.com/svn/trunk/source@2071 85d21ef8-add0-11de-ae77-5bfb9c5a3f34
the hlk package was magically recreated, deleting

git-svn-id: http://gapt.googlecode.com/svn/trunk/source@2072 85d21ef8-add0-11de-ae77-5bfb9c5a3f34