hgweb: infinite scroll support for gitweb style

hgweb: avoid invalid infinity scroll request when overwritten web.style Infinity scroll is broken when you override the web.style in the following ways: $ hg --config='web.style=gitweb' serve $ open http://localhost:8080/shortlog?style=paper ajaxScrollInit should use http://localhost:8080/shortlog/%next%?style=paper. however, http://localhost:8080/shortlog/%next% is used actually. It is missing style parameter. This patch add style parameter to request url.

hgweb: fix regexp for other styles like monoblue Some styles have indentation.

tests: introduce test for rebasing on named branches with closed heads

rebase: remove old code for handling empty rebaseset

rebase: improve error message for --base being empty or causing emptiness Before it just said 'nothing to rebase'. Now 'if "base" is an empty set: abort: empty "base" revision set - can't compute rebase set If the set of changesets to rebase can't be found from "base", it will fail as before but with more explanation of what the problem was. The name of the "base" option is not obvious - it is more like "samples identifying the branch to rebase". The error messages for problems with the specified "base" value will use that term and might thus also not be obvious, but at least they are consistent with the option name. The name "base" will not be used if the base only was specified implicitly as the working directory parent.