Remove unused merkaartor section from translation files.
Remove defunct merkaartor source files.
Use sqlite db file instead of text *.lst files for selected data.

This changes the way some data is given from one taginfo update run
to the next. Instead of plain text files an sqlite database is used.
Part of the update is a new version of the upstream sqlite.hpp file.

After this commit the update has to be run twice to get all data
updated properly.
The tagstats binary is no longer available in the repository.

You have to compile it yourself.