IMPORTANT: Ambigous local variable name in distribute.F

[arango]

The variable Aout was ambiguous in routines mp_aggregate2d and mp_aggregate3d in module distribute.F. These two new routines are used in nesting. The variable Aout is also declared in module mod_ncparam.F as a logical switch for time-averaged output fields. This error was detected correctly when compiling with gfortran. The other compilers bypassed this bug. It is amazing how compilers relax the Fortran standard nowadays. I missed this one. There are so many variables in ROMS that sometimes I forget some of them.

Many thanks to Rich Signell for bringing this to my attention.