merge with stable

filesets: use example with quotes for encoding predicate A user on IRC was confused that "encoding(ASCII)" works and "encoding(UTF-8)" fails with "parse error: encoding requires an encoding name".

phases: use graph and phase name in exchange test

phases: ``{phase}`` template keyword display the phase name ``{phaseidx}`` is providing the phase index as integer. This integer representation is useful when people need to use the fact that phase are ordered. Test keep using the number version for readability purpose.

phases: add a phasestr method on context

phases: add list of string to access phase name

phases: fix phase synchronization on push The bugs seemed to show up when element not in future common changeset should hold new hold phase data. The whole phase push machinery was rewritten in the process.

phases: implements simple revset symbol This changeset adds ``public()``, ``draft()`` and ``secret`` symbol for revset.

phases: store phase values in constant instead of using raw integer Phases constant are named after the phase name. Usage of integer have been replaced by proper constant.

sslutil: abort properly if no certificate received for https connection According to the documentation SSLSocket.getpeercert() can return None.