Edit fields dev 4 4

[jburel]

Same as gh-1746 and with an extra commit from 61885ca from gh-1753

Do not allow to edit the system group

--rebased-from #1746

[joshmoore]

Contains diff markers <<<<<<<. Added exclude

[jburel]

crap... rebasing is becoming harder and harder

[jburel]

removing exclude label, file did not get saved.

[bpindelski]

Tested:

1. editing of the system group. All works as expected - neither the root nor an admin user can edit the group.
2. description field fix - all works as expected, the description is not editable in another image after it has been changed in the first one.

Caveat:
It has been discovered that the image name field is editable by default (both gretzky and develop). Pressing the pencil icon only adds a black border.

As this PR fixes the issues from the ticket, it's OK to merge. The image name issue can be handled in another PR.

[jburel]

@bpindelski: I have created a ticket see https://trac.openmicroscopy.org.uk/ome/ticket/11716