evolvecmd: introduce a new module to handle `hg evolve` related code
__init__.py is to cluttered with wrapping and all, it's better to move code
related to evolve command to new a module which will help us in great
refactoring and introducing nice and better flow of data through functions.
There is a temporary import cycle is introduced which will be fixed in the
series.
$ cat >> $HGRCPATH <<EOF
> [ui]
> logtemplate={rev}:{node|short}[{bookmarks}] ({obsolete}/{phase}) {desc|firstline}\n
> [extensions]
> EOF
$ echo "evolve=$(echo $(dirname $TESTDIR))/hgext3rd/evolve/" >> $HGRCPATH
$ mkcommit() {
> echo "$1" > "$1"
> hg add "$1"
> hg ci -m "add $1"
> }
$ hg init repo
$ cd repo
$ mkcommit a
$ mkcommit b
test disabling commands
$ cat >> .hg/hgrc <<EOF
> [experimental]
> evolution=createmarkers
> allowunstable
> exchange
> EOF
$ hg prune | head -n 2
hg: unknown command 'prune'
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