[PATCH] Add "Start Now" option for near upcoming recordings.

[Bill <billstuff2001@…>]

The attached patch does two things:

• Adds a "Start Now" option if an upcoming recording is scheduled to start within 2 hours. Among other things, this is useful for sports events where one might want to start watching the pre-game early without adding a specific hard-coded "start early" time.
• Cleans up the "Stop Recording" and "Change Ending Time" display logic. I've run into multiple cases where a recording is in progress, but it is impossible to stop or change it. This generally happens in corner cases involving category extending and pre or post roll. This change keys the display of these options solely on the rsRecording status.

[Bill <billstuff2001@…>]

Split the original patch into two as described in ​http://www.gossamer-threads.com/lists/mythtv/dev/432508#432508

126-rsRecording.patch fixes the "Can't Stop or change recording end time" problem. 126-StartNow.new.3.patch adds the "Start Now" logic.

[gigem]

I kept this ticket open as a reminder to someday add a simplified schedule editor that only allowed changing the end time. Since I haven't gotten to it yet, it must not be that important, at least not enough to justify leaving a ticket open for 3 years.