Support sections in Extensions viewlet

[sandy081]

Support sections in Extensions viewlet

• Recommended
• Installed

[sandy081]

[sandy081]

To verify:

• Installed and Recommended sections are shown by default (when Search box is empty)
• While searching from Marketplace, a single section showing extensions from Marketplace are shown

[ghiscoding]

@sandy081 I know this subject is closed but I'm not sure if I should open a new issue for this or not. I would have preferred to have the "Recommended" on top instead of "Installed". Why? Simply because the search, which is just over the "installed" is making this confusing since it searches through the market place (not through the installed ones) and the recommended do come from the market place so it's less confusing (in my mind anyway).