Moved some functions from nodist/switcher.py to nodist/misc.py.
Added nodist/cli.py.
Separated misc.get_nodist_prefix() to two different functions.
Moved switcher.create_installation() to nodist/installer.py.
Moved switcher.switch_to() to nodist/cli.py.
Moved some parts of cli.switch_to() to cli.parse().
Added a function to remove nodes. (installer.delete_installation())
Added some functions to nodist/cli.py and modified everything to use
them.
Bug fix.
installer.delete_installation() now removes the sym link too.
Made the -d CLI option available.
Updated the README file.
Merge branch 'feature/delete-nodes' into develop