NeTV release 21 notes

NeTV release 21
This release is a minor release, which patches critical bugs based upon customer feedback. (The distinction of major vs. minor is based upon whether the board has to reboot after the update, and if the kernel/Qt was updated. This update only affects a few small packages and thus it is considered minor, even though the user-facing impact is large).

Fixes:


 * NeTVBrowser command-line should now work again
 * UI "gear" and "chumby" buttons should now be responsive while the UI is in the "connecting" phase
 * Update script was patched to work with the new NeTVBrowser command structure