create ~/.bbbike/gps_uploads directory with 0700 permission

This is consistent with creation of the parent directory ~/.bbbike,
which is also done with 0700.
set_coords_str: accept also "fz" tag if fragezeichen is added to the net

This fixes the misbehavior in BBBikeVia's "set new via point" (and
probably elsewhere) when clicking on fragezeichen lines under a route.
data update (mainly Hoenow and Hellersdorf)
data update (minor)