hgweb: regenerate web substitutions when repo is refreshed
Previously, changes to the configuration would not be picked up by a
running server. That feels like a bug. Regenerate the web substitutions
table when the repository changes.
$ hg init
$ echo This is file a1 > a
$ hg add a
$ hg commit -m "commit #0"
$ ls
a
$ echo This is file b1 > b
$ hg add b
$ hg commit -m "commit #1"
$ hg co 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
B should disappear
$ ls
a