chgserver: use util.shellenviron This avoids code duplication.

util: extract the logic calculating environment variables The method will be reused in chgserver. Move it out so it can be reused.

hgweb: generate archive links in order It would be nice for archive links to always be in a certain commonly used order, such as 'zip', 'bz', 'gzip2'. Repo index page (hgwebdir_mod) already shows archive links in this order, let's do the same in hgweb_mod. Sadly, archivespecs is a regular unordered dict, and collections.OrderedDict is new in 2.7. But requestcontext.archives is a tuple of archive types, so it can be used as an index to archivespecs.

hgweb: use archivespecs (dict) instead of archives (tuple) for "in" check

test-obsolete: stabilize output on platforms without 'serve' support The conditional was updating the repository, which wasn't reflected in subsequent logs on Windows, so the conditional is narrowed to just the serve commands. The serve operation generates log files, so those are deleted to keep the output of summary consistent.

tests: update globs for Windows The extra glob in test-command-template.t caused it to say no result was reported. It used to be (within the past year), that both this and the missing glob cases could be fixed simply by editing any output in the test, and re-running it in interactive mode. But that no longer works, and I had to diff *.t against *.t.err. I didn't dig into what changed.

help: merge the various operator sections of revsets, filesets and templates Having sections for specific operator types assumes the user already knows what type of operators are supported. By having a common heading, the user can simply lookup help for "(revsets|filesets|templates).operators".

help: apply the section headings from revsets to templates Unlike filesets, there are a few distinct headings that are not shared with revsets. But common names are used where possible.

help: apply the section headings from revsets to filesets This has the nice property of visually breaking up the wall of text. It also allows specific smaller sections to be called out. For example, `hg help filesets.predicates` now prints just the predicate section. At the moment, the revset headings are a superset of the fileset headings, so there is consistency in how example, predicate and operator help is called out. The reference to `hg help patterns` was moved to the overview section, so that it isn't stuck in the examples section.

chg: check type read from S channel The previous patch added the check server-side. This patch added it client-side.