Continue working and updating the Matlab scripts.

[arango]

Several scripts we updated to fix several compatibility issues with older versions of Matlab. I also expanded the functionality of several scripts.

I added two new directories: matlab/t_tide and matlab/tidal_ellipse to process tidal forcing for ROMS. The have been some issues with the versions of these routines when extracting data from OTPS.

I added new script matlab/forcing/write_tides.m to create and write extrated tides from OTPS. I continue working with this and I will release otps2roms.m in the future. The logic how this is done is difficult. I think that it will be much easier to use the NetCDF files availabe from OTPS.