data update
new temp_blockings_tasks task: check_recurrences
new check: .check_recurring_temp_blockings
data update (recurrence information in temp_blockings)
data update (u.a. Weihnachtsmaerkte completion)
GPS::MPS: handle version "Dg"
thumbnails-googlemaps target: fix diagnostic message
senat_b directory moved to bbbike-aux
remove outdated .gitignore entries
mapserver_address.cgi: check for valid input for DDD/DMS coordinates

Check is quite crude; it's just checking that numbers are entered, to
avoid "non-numerical" warnings.

With test cases in mapserver-util.t
data update (mainly systematic checks against LOR data)
data update