xdeltaUnstable: init at 3.1.0

This will eventually become the new stable branch (as unstable ones
are wont to do), but is worth having if you want to patch yesterday's
‘large’ files today, or need to apply patches already created with it.

“First release of the 3.1.x series. This is taken from the
"64bithash" branch.

- Adds support for -B values greater than 2GB, enabled by
  -DXD3_USE_LARGESIZET=1 variable. [Enabled in nixpkgs.]
- Adds new performance and speed regression test, written in #Golang.
  [Not enabled in nixpkgs.]

When compiled for large sizes, xdelta3 uses a 64bit checksum function.
This impacts both compression and speed.

Relative to 3.0.11, the new branch is currently 3-5% slower and
has 1-2% worse compression. Performance will be addressed in
future 3.1.x releases.”

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