switch to Boost license

[WalterBright]

I've only done about 15% of the files, will do the rest if this gets pulled. Too boring to do them all if they aren't going to get pulled :-)

[dnadlinger]

So we are good to go now? Feel free to push the merge button yourself, because:
a) I think since you are the one who made sure we can relicense the code, you should also be the person to operate the change, and/or
b) it's a trivial change only touching the file headers.

Personally, I find the GitHub link to be rather superfluous, but I'm fine with it either way.

[WalterBright]

ok, they're all done now

[ibuclaw]

I agree with David. Feel free to merge yourself as and when you are ready.

[WalterBright]

How the heck can this fail the autotester?

[mihails-strasuns]

Some weird win32 stuff again :)

[WalterBright]

Auto-merge toggled on

[joakim-noah]

Nice work, glad to see this change finally happening. I see about 15-20 files that still mention the artistic/GPL licenses though, surprisingly including several in the backend. It would be nice if you could remove all references to those previous licenses, including the texts in artistic.txt and gpl.txt, as the proliferation of licenses will be confusing to users otherwise. Also, adding a boost.txt, as opposed to simply linking to boost.org, would be good.