Added scripts to process initial conditions

[arango]

I add new scripts to process initial conditions and climatology NetCDF files:

% Preprocessing:
%
%   c_climatology - Create a ROMS climatology NetCDF file.
%   d_climatology - Driver to create a ROMS climatology file.
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%   c_initial     - Create a ROMS initial conditions NetCDF file.
%   d_initial     - Driver to create a ROMS initial conditions file.
%
% Time management:
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%   date_stamp   - Set current date string.
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% Parallelism:
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%   ptile        - Plot (overlay) ROMS horizontal tile partitions.
%   tile         - Compute ROMS horizontal tile partitions indices.
%