gcylc: count down to next reconnect attempt

[matthewrmshin]

Rename Reset Connection Polling to Reset Connection Schedule to avoid terminology confusion (with polling of task jobs).
Add tool button for Reset Connection Schedule.
Set sensitivity of Reset Connection Schedule to True only when suite is stopped.
Reconnection count down in ISO8601 duration next to last update time.

Partially address #1576. @hjoliver @benfitzpatrick please review.

[hjoliver]

Very nice, I like the countdown timer. A few thoughts on possible tweaks:

• Is "Reset Connection Schedule" too much information for users? (also it takes up a lot of tool bar space). It could be just "(Re)connect" or "(Re)connect Now", and the timer will make it clear that there is a delay before subsequent attempts
• Should the timer briefly report "Not connected" or "Suite not running?" at the first failure to connect?
• If the button is pressed - i.e. a manual reconnect attempt - should a dialog box pop up to report failure to connect?
• Hovering over the timer reports "last update time" - can you separate the timer string from the update time on the right, and perhaps use hover-over to mention that the user can use the button to bypass the current timer delay?

[matthewrmshin]

@hjoliver Bullet points 1, 2, 4 addressed. I had a brief attempt at bullet point 3, but the popup dialog box annoyed me during testing, so I thought it best to give it a miss.

[benfitzpatrick]

View menu view-adjustment options should reset the connection polling. Update time can flip between last updated time and next-reconnection-time.

[matthewrmshin]

View changes now reset connection. Update time flip now fixed.

[hjoliver]

Review 1 - good, tested, over to @benfitzpatrick.