Add missing commands to man page.
Attempt to uniform all the info and use the same conventions all over the
place.

Monitored processes list is now client/server mode compatible / Add a new entry in the API to get the server monitored processes list

This reverts commit 36feeb1d, reversing
changes made to 10d4068a.

Reconstruction the class glancesLimits

Long story short: on OS X, sys.prefix actually pointing to
/System/Library/Frameworks/Python.framework/foo, not /usr/local (which
is the default path where Glances is installed using pip or brew).

Using a self-made implementation of sys.prefix, called sys_prefix, fix
the problem.

Fix various typos
Improve sensors section
Fix some glitches and add more niceness
Rename CSS file to style.css

Fix broken test server-client