[Timber] 64 bit?

I haven't looked too deeply into the source, but it would appear that the bulk of the 64-bit problems are relegated to rts.h. Is there any effort under way to address this? If not, I will take a whack at correcting it. If there is some experimental code out there, I'd be happy to test it on my 64 bit fedora machine. -- We can't solve problems by using the same kind of thinking we used when we created them. - A. Einstein