reworked ENDIAN and TODAY.

relevant methods and attributes of the origin object bind to self in
set-method.
reworked TimeFormats-microsec-support:

There are an extra format-codes-list in the style of SFORMATS. If
allow_microsec is True MFORMATS are added to SFORMATS, so that some
formats ending on '.%f' are produced.
(Don't know if this is better now; maybe a little bit more consistent.)
reworked TimeFormats._evaluate_string
reworked DateFormats._evaluate_string a little.
made DateFormats.SFORMATS endian-specific; skip deprecated stuff
reworked DatetimeFormats._evaluate_string and _generate

_evaluate_string is now _for_string,
_generate is now _all.
bugfix: BaseFormats.__init__ missed to raise ValueError

Also reworked the timeparser.__doc__-string a bit.
v0.6.0