LogTracker, setup_new_online_tracking: die into dialog

If e.g. Net::OpenSSH is missing, then now there's an error dialog
instead of just an error message on the console.
LogTracker: reorganization of menu

The old tracking methods are now "hidden" in a sub-menu. The new
tracking method (using inotify + coordssessions) is now on top of the
menu.
LogTracker replay_accesslog fix: use uri_unescape
minor code simplification (street name experiment)
draw_street_numbers: use smaller font for larger labels

"101n" used to overflow the "bundesstrasse_table" image. Now
a smaller font is used, which now fits for a standard Vera
font with standard height. Note that the system is still
fragile, and different fonts with different sizes may still
overflow.
data update (u.a. completion of Mahlow-Waldblick)
call botchecker from bbbike-data.cgi
data update