GitLab

Added (another) layer - now 'node_ref' is between node and node_data, and it decrees whether nodes are identical

Switched the 'pragma once' to only happen on MSVC, or gcc >= 3.4 (it was causing trouble on the sun compiler)

Marked Parser, Emitter, Node, Iterator, Mark, and Null for exporting to a DLL. It appears to work properly, although VS gives me lots of warning C4251 since I didn't export all data members of each of the above classes.

It seems that it's not necessary to export those members (as long as you can't access them), and most of them are STL instances, which apparently cause lots of problems for DLLs. (For example, you simply can't export instances of std::map; see http://support.microsoft.com/kb/168958.)