swig: add tag accessors for Area::Ring and Node
swig: use java enums and avoid jni wrapper for const values
experimental: mercartor tile index
Clear file references on Close()

- fixes: opening another Database after Close()
Fix: Do not close Database when closing RoutingService
enable Database::*ByOffset(FilesOffsets)
docs
hack: projection
update swig makefiles
renamed to osmscout_jni.so
Transformer: add setProjection with bbox
swig: add constructor wrappers for Ref<*>