Did some cosmetic

Edited mostly the Info-Texts.
Set up a test.py-file, but didn't worked out any test yet.
Umbau:

logscan: options umstrukturiert
timeparse: vereinfacht
tests für timeparse.DateTimeDelta.methods hinzugefügt
logscan umgebaut.

logscan an die Geänderten Optionen angepasst und aufgeräumt.
timeparse hat eine zusätzliche Klasse AppendDateTimeOrTime:
baut eine Liste, in der die Werte gesammelt werden, damit die Option
mehrmals auftauchen darf.
actualized help-text;make timeparse fail for '-W QUATSCH'
made string_to_timedelta sensible for invalid input
bugfix: logscan skip printing on KeyboardInterrupt
logscanlib komplett überarbeitet.

Code aufgeräumt...Super!
stdin wird unterstützt!
some cosmetic and debugging

configfiles will be read in from logscan and no longer from logscanlib.
(It's the job of the prog, not of the lib.)
timecodes can be passed via logscanlib.add_timecodes

logscan: files will be closed in finally-clause

section includes start- AND end-time.
Before end-time was not included. (With the stupid side effect that the
last line of the log often was missing; logscan took the log.end-time as
end-time for section, so if this wouldn't be included...)
But this could be solved otherwise. It just seems more intuitive to
include the end-time. (Does it? I'm not sure...)
end-time after all not included.

Now I think this is more intuitive.
Log.get_section stark überarbeitet -neues Konzept.
debugging logscanlib; writing some tests
logscanlib: sys.stdin.name statt '<stdin>'
logscanlib: alle timecode-methoden als classmethods
logscanlib: _detect_timecode returns time

the time returned from _detect_timecode will be directly returned by
_get_linetime.
Before _get_linetime did the work once more.