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Fortran 90 standards for TERRAIN

Some code in the TERRAIN module is not true Fortran-90 standards, and may create problems on some machines.

To avoid this problem, change lines 14 and 15 in ia.F from:

BIT_1 = '200'O ! BINARY '10000000'
BIT_2 = '377'O ! BINARY '11111111'

TO:

BIT_1 = o'200' ! BINARY '10000000'
BIT_2 = o'377' ! BINARY '11111111'

Thanks to

Carlie J. Coats
Baron Advanced Meteorological Systems, LLC.