Allow to freely add base load edsn techologies

[grdw]

Fixes: #1528

[antw]

This looks fine, apart from one small issue.

I'm using a copy of the staging database locally, and started to import scenario 596307 from beta ETEngine. On the technology import form (prior to actually saving the new LES), the "Households aggregated" techs were assigned the "Ameland tourist profile electricity" profile in spite of that profile being excluded from auto-assignment:

[antw]

Sort profiles on included in concurrency

That feels like an awkward solution. Isn't there a way to add selected="selected" to the first <option> which is permitted to be auto-selected? Now "Ameland" appears beneath "Base-load" which isn't intuitive:

[antw]

Sort profiles on included in concurrency

That feels like an awkward solution.

Perhaps a nice compromise is to do something like #1459 and sort profiles into two optgroups, with included_in_concurrency being called "Featured", and everything else called "Other"?

That has the advantage of making it obvious to a visitor which profiles are official and which have been uploaded by third-parties?

+--------------------------------------+---+
| Profile                              | v |
+--------------------------------------+---+
| Featured                                 |
|   Base-load profile EDSN type E1A        |
|   Base-load profile EDSN type E1B        |
|   ...                                    |
| Other                                    |
|   Ameland tourist profile electricity    |
|   ...                                    |
+------------------------------------------+