Hitting done twice quickly on addTransect creates multiple entries

[dryror]

When selecting done on the addTransect screen, if you press it quickly enough multiple times, it creates multiple entries.

This will likely be an issue with all buttons if the application allows the event listener to fire multiple times in succession.

[NickGulajec]

Perhaps a 100ms timer could act as a de-bounce.

[kblairwhite]

Added timer to disable done button for 1 second to prevent double entry - 1 second should be enough can change if needed.