Adding active OBC for NWA12

[gseijo13]

These parameters need to be added to default MOM_input in NWA12:

OBC_NUMBER_OF_SEGMENTS = 3
OBC_SEGMENT_001 = "J=0,I=0:N,FLATHER,ORLANSKI,NUDGED,ORLANSKI_TAN,NUDGED_TAN"
OBC_SEGMENT_002 = "J=N,I=N:0,FLATHER,ORLANSKI,NUDGED,ORLANSKI_TAN,NUDGED_TAN"
OBC_SEGMENT_003 = "I=N,J=0:N,FLATHER,ORLANSKI,NUDGED,ORLANSKI_TAN,NUDGED_TAN"

OBC_SEGMENT_001_DATA = "U=file:u_001_2005.nc(u),V=file:v_001_2005.nc(v),SSH=file:zeta_001_2005.nc(zeta), TEMP=file:temp_001_2005.nc(temp),SALT=file:salt_001_2005.nc(salt)"
OBC_SEGMENT_002_DATA = "U=file:u_002_2005.nc(u),V=file:v_002_2005.nc(v),SSH=file:zeta_002_2005.nc(zeta), TEMP=file:temp_002_2005.nc(temp),SALT=file:salt_002_2005.nc(salt)"
OBC_SEGMENT_003_DATA = "U=file:u_003_2005.nc(u),V=file:v_003_2005.nc(v),SSH=file:zeta_003_2005.nc(zeta), TEMP=file:temp_003_2005.nc(temp),SALT=file:salt_003_2005.nc(salt)"

OBC_FREESLIP_VORTICITY = False
OBC_COMPUTED_VORTICITY = True
OBC_FREESLIP_STRAIN = False
OBC_COMPUTED_STRAIN = True
OBC_ZERO_BIHARMONIC = True

#---the following 4 parameters are taken from the GFDL nwa12:
OBC_SEGMENT_002_VELOCITY_NUDGING_TIMESCALES = 3.0, 360.0
OBC_SEGMENT_003_VELOCITY_NUDGING_TIMESCALES = 3.0, 360.0
OBC_TRACER_RESERVOIR_LENGTH_SCALE_OUT = 9000.0
OBC_TRACER_RESERVOIR_LENGTH_SCALE_IN = 9000.0

BRUSHCUTTER_MODE = True