Remove unneeded "import os.path"

send conservatively capitalized HTTP headers

demandimport: handling new relative imports Mercurial does not work on python2.6 because __import__ takes an additional argument called level. This patch merely calls the built-in __import__ when level is passed.

hgweb: move HTTP content types out of header templates This removes the ability for templates to add custom HTTP headers, which can easily be re-added if someone needs it. Thanks to asak for repeatedly reviewing this patch and helping to iron out the quirks.