createTurbulenceFields: Specification of turbulence fields now command-line option

Usage: createTurbulenceFields [OPTIONS]
options:
  -case <dir>       specify alternate case directory, default is the cwd
  -constant         include the 'constant/' dir in the times list
  -fields <wordReList>
                    specify which turbulence fields (k, epsilon, omega, R) to
                    write - eg '(k omega)' or '(R)' or '(.*)'.
  -latestTime       select the latest time
  -newTimes         select the new times
  -noFunctionObjects
                    do not execute functionObjects
  -noZero           exclude the '0/' dir from the times list, has precedence
                    over the -withZero option
  -parallel         run in parallel
  -roots <(dir1 .. dirN)>
                    slave root directories for distributed running
  -time <ranges>    comma-separated time ranges - eg, ':10,20,40:70,1000:'
  -srcDoc           display source code in browser
  -doc              display application documentation in browser
  -help             print the usage

Resolves feature request http://www.openfoam.org/mantisbt/view.php?id=1912