Fixed getObjectNames, somehow the strings didn't get copied properly
(even copy.deepcopy didn't help).

Added timeBaseInfo, getTimeBaseInfo and getTimebase.

I tried the same dtype=None as in getSignal but this leads to conversion
error by libddww. Can it be that RAW retrieval of the timebase is not
(yet) supported by libddww?
Merge pull request #13 from BSieglin/master

Fixed getObjectNames, somehow the strings didn't get copied properly