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.