Dropped internal quazip for unix systems.

The internal version is way too old and fails to compile on a modern
system.
FIX: Don't try GET ... /full on nodes, as API does not support it.
Implemented jOSM-like load_objects feature.
ADD: New tool for simple conversion of way segments into bridges or culverts.
FIX: Added locking to Way::add and Way::remove.

Although I'm not 100% sure it's the right thing to do, it seems to
eliminate the crashes I've been experiencing, mostly due to changing way
length.
FIX: Fixed crash on moving virtual node.

By not allowing virtual nodes to be moved.