Document Addendum

Some extra functions are added:

ACOS(arg) and DACOS(arg) - Arc Cosine (radians)
ASIN(arg) and DASIN(arg) - Arc Sine (radians)
TAN(arg) and DTAN(Arg)   - Tangent (radians)

ATM[V1,V2]               - Arc tangent of V1/V2, 4 quadrant version
				(ATAN2 in normal Fortran)

Also Enter mostly mode more or less works.

Please note: When function key files are running (from depressing
function keys using the AnalyKeypad.Arc files in area DK:), they
expect their input in the LOWER window. This will probably be
cleaned up eventually but for now is the case.