The ForgeHg tool uses the Mercurial package which is GPLd. That means we can't distribute ForgeHg through Apache.
We should make a separate repo for ForgeHg (sourceforge project, perhaps) and move it all there. ForgeHg should be installable as an optional dependency.
See also [#4647]
forge:ph/4655 is ready to merge as soon as the new ForgeHg-0.1.0 hits pythontree (https://trac.geek.net/trac/siteops/ticket/52668)