GitLab

- from Module.xxx_to_string to Module.Print.string_of_xxxx
- from Module.print_xxx to Module.Print.pp_xx

- refactoring in types.ml
- add Types.squareapply
- other fixes

	Add --bytecode option for configure

	update_tlv?)
Add uninstall mode for hooks in tools/install_hooks.sh

Switch typesTest from OUnit to OUnit2 (mostly to get a correct exit value)

Conflicts:
	typing/typer.ml

Conflicts:
	tests/libtest/tallyingTest.ml
	types/types.ml
	types/types.mli

- Add delta as optional parameter to Tallying.talling.
- Add (++) product of two lazy types substitutions.
- Add (@@) application of a lazy type substition to a type.
- Add ($$) application of a explicit type substution to a type.