implement appstore list as gotten from api.
Fix tab width in appstore.
Add visual reference for installed apps.
Add pagination to 'appstore'.
Implement application specific page.

App data for the specific page is taken from cache of apps gathered
from 'appstore'.
Add reloading first page after returning to appstore.
Fix header menu links.
Replace depricated 'bindAttr' method with 'bind-attr'.
Modify 'Installed apps' table in 'appstore'.
Check if account exists before reading account info.