Adds VS2010 solution and project files
Fixes a (possible) stack overflow

The stack overflow occurred in debug mode, due to the recurrent deletion of the
nodes of the binary tree (scenario: lots of nodes with same CRC & hash).

This is rather a quick-and-dirty fix, as I don't really know how the tree
itself is used from the outside (what's the owner concept? not clear).
The fix suppresses the recurrence and uses loops instead.