Long file support

[rsaxvc]

Once the cursor offset exceeds 0x7fffffff, the address column has some integer overflow issues, and the cursor misaligns. Similar issues and scrolling rolloff beyond 0xffffffff.

I've started hacking on a patch for these.

[maneatingcow]

I've just run into this where e.g. 0x17A138000 displays as 0x7A138000. A fix would be much appreciated!

[rsaxvc]

Realizing it has been 3 months, I may not get back to it for a while.