tests/test-batching.py.out

perf: use a formatter for output

We use a `formatter` object in the perf extensions. This allow the use of
formatted output like json. To avoid adding logic to create a formatter and pass
it around to the timer function in every command, we add a `gettimer` function
in charge of returning a `timer` function as simple as before but embedding an
appropriate formatter.

This new `gettimer` function also return the formatter as it needs to be
explicitly closed at the end of the command.

example output:


  $ hg --config ui.formatjson=True perfvolatilesets visible obsolete
  [
   {
    "comb": 0.02,
    "count": 126,
    "sys": 0.0,
    "title": "obsolete",
    "user": 0.02,
    "wall": 0.0199398994446
   },
   {
    "comb": 0.02,
    "count": 117,
    "sys": 0.0,
    "title": "visible",
    "user": 0.02,
    "wall": 0.0250301361084
   }
  ]

== Local
Ready.
Un and Deux
Eins und Zwei
One and Two
Nope
Eins und Zwei
Hello, John Smith
Ready.
Uno und Due

== Remote
Ready.
REQ: foo?one=Vo&two=Efvy
  -> Vo!boe!Efvy
Un and Deux
REQ: bar?b=Fjot&a=[xfj
  -> Fjot!voe![xfj
Eins und Zwei
REQ: batch?cmds=foo:one=Pof,two=Uxp;bar:b=Fjot,a=[xfj
  -> Pof!boe!Uxp;Fjot!voe![xfj
REQ: greet?name=Kpio!Tnjui
  -> Ifmmp-!Kpio!Tnjui
REQ: batch?cmds=bar:b=Vop,a=Evf
  -> Vop!voe!Evf
One and Two
Nope
Eins und Zwei
Hello, John Smith
Ready.
Uno und Due