removed finiteness assumption from set_rename_perm

alpha_abs_set_stronger1

alpha_abs_let_stronger is not true in the same form

the function translating lambda terms to locally nameless lambda terms; still needs a stronger abs_eq_iff lemma...at the moment only proved for restrictions

modified the renaming_perm lemmas

added a translation function from lambda-terms to deBruijn terms (equivariance fails at the moment)

added a few examples of functions to Lambda.thy

exported nominal function code to external file

removed old testing code from Lambda.thy

moved high level code from LamTest into the main libraries.

eliminated tracing code; added flag so that equivariance is only proved for the function graph, not the relation

subst also works now

nominal_function works now completely for frees and depth; still a propbelm with subst; no unproved assumptions

strengthened renaming lemmas

added eqvt_lemmas for subset and psubset

a few lemmas about freshness for at and at_base

added a property about finite support in the presense of eqvt_at

instantiated fundef_ex1_eqvt_at theorem with the indction hypothesis

solved subgoals for depth and subst function

added eqvt_at premises in function definition - however not proved at the moment

added one further lemma about equivariance of THE_default

equivariance of THE_default under the uniqueness assumption

derived equivariance for the function graph and function relation

a modified function package where, as a test, True has been injected into the compatibility condictions

removed last traces of debugging code

removed debugging code abd introduced a guarded tracing function

moved Weakening up....it does not compile when put at the last position

tuned

added weakening to the test cases

cleaned up weakening proof and added a version with finit sets