When a project group is open, still want access to regular recent project list.

Use case:
    - working on some standalone modules
    - Open a project group
    - want to get some stuff from recently open project and use it with
      projects in the group.
    - popup "Open recent projects" to select project just working on.

Observe: the modules I was just working on are not in recent projects list.

I saw in a comment to an issue that somewhen (7.4 or 7.3) recent projects was
tied to a project group. This probably explains some of the difficulty
and confusion I've had looking for stuff in recent project list.


I suppose there are a variety of ways this could be fixed.

Simple fix - when a project group is active, have two popup menu items
(following not a proposal, just for example)

    open recent group project   curent group list
                                (projectui/groups/xxx/org/.../ui.properties)

    open recent project         non-group list
                                (projectui.properties)


complex fix -
Othere schemes could involve merging list or most general, using nested lists
and harder to figure out names...

    open recent project                                 current list behavior

    open recent other lists > non-group
                              group2
                              group3

where each group? in turn has list that can be examined...