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Improved Polyweld Tool

This tool has several bugs. Use at your own risk.
I would fix them if I had more time.

Description:
This tool takes two or more props and welds them together.

The difference between this tool, the smart weld tool, or the multiparent tool is that this tool literally combines the physics meshes of each prop together.
What does that mean? For all intents and purposes, your props are now one single prop.
Watch the video for more information.

This version does not crash the game like the old version and is much more stable.
Useful for Flood, DarkRP, and any Sandbox-based gamemode. Will cut lag almost entirely from servers which typically have lots of unfrozen welded props.
This version also includes more features as a tool.

Duplicating polywelded objects will not work very well. It will never work perfectly due to the nature of the tool. Sorry.
Saved games will not maintain the polyweld either.

Note that this is NOT a REPLACEMENT for the weld tool. The polyweld tool is made for finalizing props into a single static mesh, and it is more or less permanent. Don't polyweld until all your props are placed and ready, and don't add entities to the polyweld unless you know that they will still work afterward.

ConVars:
Use sbox_maxpolysize to change the maximum amount of props which can be PolyWelded at once. 100 is default.
Setting this too high might allow minges to crash the server with 400-prop PolyWelds. It's not THAT stable...

Attribution:
Some credit to Sir Haza for making the original tool, even though the code is hardly the same in this version.

Facepunch:
http://facepunch.com/showthread.php?t=1438254

Enjoy!