hgweb: consistently add search form to all gitweb pages
Paper has it on all pages. Not sure why gitweb doesn't. I think it
should be everywhere because it is a useful feature.
Also, we weren't consistently adding the HTML in the same place. This
was OK since the element is absolutely positioned. But this bothered
me a bit, so I went ahead and fixed it.
$ hg init
$ touch unknown
$ touch a
$ hg add a
$ hg ci -m "1"
$ touch b
$ hg add b
$ hg ci -m "2"
Should show unknown
$ hg status
? unknown
$ hg revert -r 0 --all
removing b
Should show unknown and b removed
$ hg status
R b
? unknown
Should show a and unknown
$ ls
a
unknown