change to newer macro escape mechanism, using uints in more places
comments & whitespace
starting to add sexp encoder
part of macro scoping redesign
move stmt expansion code
bugfixes, add get-names-from-pattern fn (and test case)
working on adding let-renaming
parser comments
adding fresh_name_fn
bugfixing
removed obsolete reference to purity
rename repr to name
removed some interner fields
cleanup of (now) unused cxs
cleanup, cleanup