Allow projects queries to group results by custom fields

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Projects queries should already be able to search by custom fields, if you specify search in the field specification. Here's a screenshot of my local install that lets me search by "Project Motto":

Some possible issues:

• You don't have search specified in the config.
• You are trying to search on a field which does not currently support indexing (I think there are only a handful of these). What type of field do you want to search on?

Search is enabled for our custom fields but they are of the pop-up menu kind. You are correct that search works.

Okay. I'm going to merge this into T5018 since both applications use the same underlying infrastructure, which is where almost all of the changes would need to take place.