Show unreleased versions first on versions list under Requirement Test Coverage section

 On Requirement Test Coverage section, the version select box must display unreleased versions under an options group called 'Unreleased versions' (on top of the list), by doing so the selection of a unreleased version, in a project with a long list of versions, should be easier for the user. 

Then all released versions should be shown after a  "Released version" delimiter.