On reports make current employer available as a field for display

[yashodha]

Overview

Expose current employer in fields and display in results as well. I think this was supported earlier.

Before

After

[civibot]

(Standard links)

• If this is your first pull-request for CiviCRM, please browse CONTRIBUTING.md for information about the development and testing processes.
• If you are reviewing this pull-request, you may wish to consult the test sites and the Review Standards (long template, short template).

[totten]

Aside/short term tip for reviewers -- The link for the "test sites" above points at an old server. Fixing the bot is a TODO; in the interim, you should be able to edit the link a little to get to the right page:

• Example, bad: http://site-list.test-ubu1204-5.civicrm.org/?filter=core-12904-*
• Example, good: http://site-list.test-1.civicrm.org/?filter=core-12904-*

Note how the test-ubu1204-5 changes to test-1.

[Clairepickle]

Tested on demo site and works as expected

[eileenmcnaughton]

merging based on @Clairepickle testing. Code looks sensible & non-risky

[yashodha]

@Clairepickle @eileenmcnaughton thanks!