A fast Mercurial command without slow Python startup
Description
chg is a C wrapper for the hg command. Typically, when you type hg, a new
Python process is created, Mercurial is loaded, and your requested command runs
and the process exits.
With chg, a Mercurial command server background process is created that runs
Mercurial. When you type chg, a C program connects to that background process
and executes Mercurial commands.
