FIX: do not reset in-transit values when saving

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7214 8aca7d54-2c30-db11-9de9-000461428c89
CODE: remove CACHE_TRANSIT

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7215 8aca7d54-2c30-db11-9de9-000461428c89
CODE: remove member ware_production_t::transit to avoid double book-keeping

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7216 8aca7d54-2c30-db11-9de9-000461428c89
FIX: int-hashtables were broken for uint64 keys, introduce hash_t::diff_type for differences of key_t values

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7217 8aca7d54-2c30-db11-9de9-000461428c89
FIX: set default value to static variable after its initialization

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7218 8aca7d54-2c30-db11-9de9-000461428c89