glances: fix crasher

you need to call the function otherwise you will try running float() on
a function later when you try displaying it

Introduced in eda1cf5b

Fix memory active/inactive bug on Windows

Fixes and improvements

Refactor classes

refactor glancesStats into three classes. This way glances can support a
new backend like the Cloud Monitoring Agent in a more clean manner.

there were a lot of lines with end of line whitespace. Clean it all up.

Sensors module

Add systemd support

Fix html template path in glancesHtml class

Fix python3 support

Fix bugs for psutil < 0.6.0