hydra: added missing fields to query

Dependencies

• [2] OZ5UBJEK
• [3] SZYY2EQQ * Make the queries more readable.
• [*] J5UVLXOK * Start of a basic Catalyst web interface.

Change contents

• replacement in src/lib/Hydra/Schema/Builds.pm at line 548
  [2.79]→[2.79:106](∅→∅)
  − x.nixExprPath,
  [2.79]

  [3.794]
  + x.nixExprPath, x.maxsilent, x.timeout,