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.

hgweb: revert to showing file instead of offering for download

hgweb: be sure to send a valid content-type for raw files

hgweb: use ErrorResponse instead of custom response

better error reporting for hg serve errors in tests

hgweb: fix a stupid KeyError introduced in a0e20a5eba3c Thanks to Christian Ebert for finding this. Also added a test to prevent this from happening again.

hgweb: cleanup buglet introduced in 956afc025c0f

merge with crew-stable

CVS convert: Find correct parent for new branch (issue704) Previously the parent was determined by the last changeset where the branched file was changed even if the branch is based on an earlier revision. Fix written by mpm.

Test for converting a CVS branch