Updates to roms_info.m

Now finds files if given a directory

Signed-off-by: deepak <dpak.cherian@gmail.com>
Added tracmass read function

Signed-off-by: deepak <dpak.cherian@gmail.com>
Minor update

Signed-off-by: deepak <dpak.cherian@gmail.com>
tracmass_read now converts to km.
Updates to roms_read_data
Added ocean_time to wilkin's roms_get_grid function.

Signed-off-by: deepak <dpak.cherian@gmail.com>