List refresh bug...
Separated tab fragments into separate listfragment classes

This allows us to do different things with each tab
Modified portfolioselect to display tabbed view

When a portfolio is clicked, the activity "PortfolioSelect" will open
and display a tabbed view of held stocks in one tab and watched stocks
in the other.
Set portfolio name as activity title in PortfolioSelect
Added simple context menu to portfolio tab

This will eventually be used to remove portfolios from the list
Deleting portfolio from database working
PortfolioSelect correctly implemented

Held stocks queries database
PortfolioSelect tab watched stocks queries database
NOW watched stocks tab queries db
merged with steven's branch, fixed some errors