FIX: navigation with buttons in tab panel

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6280 8aca7d54-2c30-db11-9de9-000461428c89
sqapi: add pretty-print functions for integers, floats, money values

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6281 8aca7d54-2c30-db11-9de9-000461428c89
sqapi: accept floats as arguments

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6282 8aca7d54-2c30-db11-9de9-000461428c89
CODE: remove unused variables

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6283 8aca7d54-2c30-db11-9de9-000461428c89
sqapi: doc adjustments

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6284 8aca7d54-2c30-db11-9de9-000461428c89