Merge of x86_64 branch

Hi,

After some testing, I'm committing a merge of Andrey's work on 64-bit build support (branches/x86_64) into the main trunk. Most of Andrey's work is changing typecasts into C++ *_cast<>() syntax, which help search for them when narrowing down type-related issues.

I've built and tested the Windows version using VS2005 and VS2010, and it seems to work OK.
I have NOT build wx under windows with this, nor (yet) the 32 bit Linux version.

I know this is a bit of a wide change, but I think the sooner we do this in the trunk, the better off we'll be in the long term.

Other than that, it looks like we'll have another formal release in a couple of weeks.

Cheers,

  Rony


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