Exchange detail screen working.

The exchange detail screen now loads and displays details for a
selected exchange. Scrolling still isn’t operational.
Exchange detail screen working as desired.

The exchange detail screen is now working as I desire. It displays all
of the current exchange data values and the user can scroll through
them.
Cleaned up the comments.

The file now has comments explaining what’s going on and I removed all
of the old commented out legacy code.