InfoNav on setup screen taking too many resources

[brianp]

While reviewing memory usage in the application it's come to our attention the InfoNav runs high in memory usage, and does not release this memory once we navigate to the main screen.

If we remove the InfoNav we reclaim about 300mb from both setup and main screen. This makes up about 35% of memory used by the front end.

Two problems need solving:

• Find out why it uses so much memory
• Release this memory when moving to the main screen