New feature: comparing data for a node between environments

[tuxmea]

Request

As a Puppet admin I want to compare data between two environments in case that a node receives different settings from environment A compared to environment B

Solution 1

Select environment -> node -> Key

A new pull down menu shows up (or gets enabled) with the title "compare".
Content are the available environments.
After selecting the second environment, a new pane opens with the hierarchies and the data per hierachy for the selected key.

Solution 2

Based on #241
When showing the result set, we also add a "compare" pull down menu.
Data are shown left (actual environment) and right (selected comparing environment).

Optional with the possibility to synchronize scrolling.

[tuxmea]

Check if already implemented when choosing "node is not in env".

[tuxmea]

To complex. needs to much clicking.

[tuxmea]

Implemented.