Description of problem:
This should probably actually be two bugs, but I think they're a little intermingled.

It's not entirely obvious how to remove a system registered to Katello. Adding to the confusion is the wonkiness of the select deselect method which seems to open a system info pane.

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.  Register a system to katello; navigate to system view
2.  Note the grayed out "remove system" button. Fiddle with the UI for several minutes before you realize you need to ctrl-click a system to select it and subsequently enable the remove system button.
3.  Ctrl click this system again.
  
Actual results:
* As noted in step #2, there's no indication that you need to ctrl-click items in the list in order to enable removal
* Upon ctrl-clicking a second time, instead of de-selecting, which is the intuitive behavior, it instead opens the system details pane.

Expected results:

* Why don't we have a 'remove system' link in the system details view?  Now, obviously this wouldn't work for en masse system removal, but it at least goes along with the design across the rest of the UI.
* After ctrl-clicking an item to select it, doing so again should de-select rather than open the system details.

Additional info:

I am not sure what happens when you ctrl-click and you have more than one system selected. I suppose it probably opens the details of the system where hover resides.