realtime oceanus das files

Many of the realtime oceanus das processing software had to be updated
due to new file formats and and slightly different data configurations.
It has been tested and hopefully I found all of the bugs.
cakima no extrapolation

The default in cakima was to extrapolate the interpolation to the
maximum values of x. The code is changed so that it only interpolated
to the non-NaN values of y.