tkbabybike: better diagnostics if .dim file does not exist
re-generated berlin_small image for tkbabybike
gitignore _Inline in babybike
gitignore brb_tiles in babybike
babybike Makefile improvements

* perl for bbbikedraw.pl configurable
* add a missing mkdir
new renderer BBBikeDraw::Mapnik
MANIFEST update
babybike/Makefile: new variable BBBIKEDRAW_RENDERER
file name of .inl files changed in newer Inline versions

Previously (Inline 0.5x) it was just the basename of the package, now
(Inline 0.6x) it consists apparently of the full package (Inline.inl
vs. Strassen-Inline.inl)
data update