Timer Interrupt

Added TimerOne.h
Change LED indicator to match camera trigger
Include indicator update in image acquisition

Stage 4 requires indicator change to match camera trigger
FD acquire, One block and bugfixes

There was an error in the camera state machine. It should check for
whether i<e before waiting for the delay. This way if the cameraDelay is
long then it should move straight to imStage 5 when all images are
acquired. i.e. swapped the two lines over.

Also added Flat Dark acquire option and acquire one block option (for
grid imaging)
Combine nasal and tracheal code

Add a global variable to determine the interrupt used
Simplify interrupt system

Create one single interrupt enable and remove interrupt disable and
continue code
Remove FD acquire

FD acquire doesn't work for large numbers of images due to the
interrupt. Code removed for the moment.
Merge remote-tracking branch 'origin/2014B'

Conflicts:
	WCH_Timing_Box.ino