data update
create_fragezeichen_nextcheck: preserve also "ignrte" category attribute
custom layer routing: ignore records marked with "ignrte"
data update (mainly additions in Spandau, Staaken, Falkenhagener Feld,
Hakenfelde, Wilhelmstadt...)
GpsmanData: warning fixes in Comment_to_unixtime

If DateTime and Comment are empty or undefined, then return early to
avoid warnings.
GPS: BOM handling in gpx/kml files

XML files (kml, gpx) may have a BOM. This needs to be ignored when
doing magic checks in GPS.pm.

With test.
new (private) Makefile target fragezeichen-nextcheck-home-home.org
data update (mainly updates in Marzahn)