Small refactoring of sensors plugin
Monitored list works again
First commit with the help screen
Add the plugins list method to the server
Client/Server works but no process are displayed. Also rename In/Out by Read/Write for DiskIO according to #339
Correct a bug on the client/server mode for processes list
Client/server is working but not the monitored list
Monitor list also works in c/s mode
Patch for Mac OS X compat
Correct automatic sort
Fix python3 in server mode
Add process list display toggle.

Parsing and displaying the process list takes a sometimes significant
amount of resources. Since there is already a mechanism in place to run
glances with the process list disabled, it was easy to add a toggle to
the __catchKey function
Merge branch 'develop' of github.com:weaselkeeper/glances into develop