Group lists by category feature

[xh3n1]

-phpList/phplist-ui-bootlist#74 needs to be merged for lists to be split into two columns.

[xh3n1]

I will resolve merge conflicts.

[samtuke]

@xh3n1 Can you remove the extra margin at the bottom of lists? Currently they make the accordion section content have unbalanced whitespace at top and bottom of the section.

[suelaP]

We should change the following behavior:
Currently if a Category has only private lists assigned to it will still be shown as a category in the front-end.
We should only display categories that have at least on public list assigned.

[samtuke]

Currently the list name is repeated twice, and the list description isn't stated (when group by categories is used).

[xh3n1]

@samtuke it's not the list name that's repeated, it's the description.

[xh3n1]

oh, i see what you mean, I'm checking now.

[xh3n1]

@suelaP it was happening only when lists were not selected on the subscribe page (all public lists displayed all by default), but I committed a change and it should be good now.

[xh3n1]

@samtuke I added the default setting on configuration page

[xh3n1]

@samtuke I pushed a commit here for the bottom margin.

[samtuke]

This feature in action (depends on changes to bootlist/trevelin theme also):

Per-list settings:

Global setting:

Example subscribe page single column:

Example subscribe page dual column: