added definition of section as keyword
corrected indentation error
Types: parse time and datetime with microseconds

Since python writes time and datetime with microseconds
  "%H:%M:%S.%f"
the date_get and datetime_get methods now also accept
this format.

Conflicts:
	odml/types.py
Cosmetic changes, save xml encoded as utf8.
setup: optional setuptools support
Value: try to infer dtype from data
Value: guess dtype only when not specified
Infer type 'text' if a string contains '\n'
Value: small bugfix
UnitTest for type guessing when no dtype is specified on value creation.