- send error messages to stderr
- added -h/-help options where some were missing
- changed 3-space to 4-space indentation
- where possible, allow multiple directories from the command-line
- move tutorial cleanup to the end in case the user wishes to
abort the wcleanAll script
- adjusted wcleanAlmostAll according, but don't know if it's really
needed any more
- match comments to names of scripts
- remove comments about using C-shell (not true anymore)
- use 'assert' style syntax in places instead of if/then/fi
- wcleanMachine supports multiple arguments
