co.py: add --dest option and made no-delete the default
co.py: add --dest option and made no-delete the default

Also, the delet option is now "erase" so that there are not to many
options starting with 'd'.

fretboardfreak/code,fretboardfreak/code,fretboardfreak/code,fretboardfreak/code,fretboardfreak/code,fretboardfreak/code,fretboardfreak/code,fretboardfreak/code,fretboardfreak/code