bundlerepo: apply phase data stored in the bundle instead of assuming `draft`
The phase information contained in the changegroup part and the explicit
`phase-heads` part are now taken in account.
Initial changes and test by Matt Harbison, code rework by Pierre-Yves David.
$ hg init
$ echo 123 > a
$ hg add a
$ hg commit -m "first" a
$ mkdir sub
$ echo 321 > sub/b
$ hg add sub/b
$ hg commit -m "second" sub/b
$ cat sub/b
321
$ hg co 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ cat sub/b 2>/dev/null || echo "sub/b not present"
sub/b not present
$ test -d sub || echo "sub not present"
sub not present