M.gif -> M.png
bbd2osm: added -experiment switch

Analog to same-named switch in osm2bbd: enable some experiments
without tweaking the source code.
Makefile.garmin: moved variable definition
commented %orte
fixed typo
regenerated html pages
typo
removed unnecessary undefs
Msg: PERL_MSG_REPORT_MISSING
added a number of missing English translations
data update (minor)