Add "last modified" field to the Custom Query

[l.usherwood@…]

USE CASES:

1. You've been out of the office for a week and want to catch up with recent developments and/or discussions.
2. Locating bugs you've have recently edited. You change a whole bunch of tickets and then realize you've set one field incorrectly. Querying the field is no good, it brings up many false positives.

SUGGESTION:

Could "last modified" be added to the list of fields available in a Custom Query?

I imagine that two date fields would be required (To and From), both of which are optional. Leaving either blank means no limit is imposed.

[cboos]

Duplicate of #2288.