Adjusted signature of DirExec module functions.
Adjusted signature of DirExec module functions.

  - added parameter for function which executes the selected program
  - renamed dirExecPromptWithName to dirExecPromptNamed

darcs-hash:20080301171905-69f16-89aa5a796f0f86ff916bb6761f479ae28512aff1

jthornber/XMonadContrib,jthornber/XMonadContrib