already partially implemented - submitting issue to track svn commits

r9927 Initial commit of parameterized builds. Provided functionality:

• users can define parameters per project (only string paramters for now)
• if a project has parameters, the 'build' button will redirect to an input page
• parameter values can be used as ${variable} in Ant, Maven and
  CommandInterpreter builders
• after the build, parameter values can be viewed in a separate page
• tasks for parameterized builds are persisted in the queue over restarts
• queue persistence is now in XML (with backwards compatibility for text format)