Survey (Grid).copter. Change waypoint delay.
	Delay increments are now .1 seconds.

FlightPlanner:
	Recenter map when loading poly from file.
	Change type of "p1" to accommodate for the delay change.
Survey (Grid) HeadingHold upgrade.

The heading hold value will now adjust with the angle of the flight path.
Survey(Grid) Save "checked" for internals and footprints.

User requested survey save the checked option.
Merge pull request #605 from tristannovak/master

Survey (Grid) Delay and HeadingHold Upgrades