Remove TFL.UI and TFL.TKT packages

Move  _TFL/_TKT/_Tk/CTK.py and _TFL/_TKT/_Tk/CT_TK.py
to _TGL/...
Improve Python-3 compatibility of package TFL

* Print function, not statement

* Raise syntax

* Except syntax

* iterkeys, ...

* Iterator changes

* Add to pyk: `builtins`, `config_parser`, `ifilter`, `reprify`

* Fix `portable_repr`: `dict` items, empty `tuple`, `unicode`; add `set`

* Add `Secure_Hash`
Improve Python-3 compatibility of package CAL

* Print function, not statement

* Raise syntax

* Except syntax

* Iterator changes
Improve Python-3 compatibility of package PMA

* Metaclass declaration

* Print function, not statement

* Raise syntax

* Except syntax

* Iterator changes
Improve Python-3 compatibility of package ATAX

* Print function, not statement

* Raise syntax

* Except syntax

* Iterator changes
Improve Python-3 compatibility of package MOM

* Use `TFL.Meta.BaM`, not class variable `__metaclass__`

* Print function, not statement

* Raise syntax

* Except syntax

* Iterator changes

* unicode vs. str

* Use `portable_repr`, `Secure_Hash`
Improve Python-3 compatibility of package GTW

* Use `TFL.Meta.BaM`, not class variable `__metaclass__`

* Print function, not statement

* Raise syntax

* Except syntax

* Iterator changes

* unicode vs. str

* Use `portable_repr`, `Secure_Hash`
Improve Python-3 compatibility of package JNJ

* Use `TFL.Meta.BaM`, not class variable `__metaclass__`

* Print function, not statement

* Raise syntax

* Except syntax

* Iterator changes

* unicode vs. str
Merge branch '3': improve Python-3 compatibility

Except for some problems with third party packages, in particular
rsclib, sqlalchemy, and werkzeug, all tests pass under Python-3.4