Allow _ in release names

Dependencies

• [2] 4KLYYXWW Allow dashes in attrNames
• [3] HQGXL4MX Add validation for project and jobset names
• [4] W63765MK Add dollar to pathCompRE, which allows files with dollars in them to be served by Hydra, e.g. sphinx generated docs often has these types of files.
• [*] LBNVQXUB * Build the /build stuff in a separate controller.

Change contents

• replacement in src/lib/Hydra/Helper/CatalystUtils.pm at line 217
  [3.1697]→[3.1697:1763](∅→∅)
  − Readonly our $relNameRE => "(?:[A-Za-z0-9-][A-Za-z0-9-\.]*)";
  [3.1697]

  [2.0]
  + Readonly our $relNameRE => "(?:[A-Za-z0-9-_][A-Za-z0-9-\._]*)";