make default branch default, remove quotes

Dependencies

• [2] M73H45NE add support for mercurial tags/revs
• [3] O25D52TA initial support for mercurial
• [*] OOQ2D3KC * Refactoring: move fetchInput out of hydra_scheduler into a separate

Change contents

• edit in src/lib/Hydra/Helper/AddBuilds.pm at line 472
  [2.43]

  [3.374]
  + $id = defined $id ? $id : "default";
• replacement in src/lib/Hydra/Helper/AddBuilds.pm at line 493
  [3.972]→[2.44:171](∅→∅)
  − (my $res1, $stdout, $stderr) = captureStdoutStderr(600,("hg", "log", "-r", $id, "--template", "'{node|short} {branch}'"));
  [3.972]

  [2.171]
  + (my $res1, $stdout, $stderr) = captureStdoutStderr(600,("hg", "log", "-r", $id, "--template", "{node|short} {branch}"));