Function healpixResolution( k )

Description:
Gives the approximate resolution in degrees for a given HEALPix resolution parameter k This k value is the logarithm to base 2 of the Nside parameter.
Parameters:
k (integer)
HEALPix order (0..29)
Return Value (floating point):
approximate angular resolution in degrees
Signature:
double healpixResolution(int)