Adjusted signature of DirExec module functions.   - added parameter for function which executes the selected program   - renamed dirExecPromptWithName to dirExecPromptNamed
Adjusted signature of DirExec module functions.
  - added parameter for function which executes the selected program
  - renamed dirExecPromptWithName to dirExecPromptNamed
MasseR/xmonadcontrib,MasseR/xmonadcontrib