Added first version of the new backward tracking method. It is now possible to use interpolation methods as well.

Bugfix, Plotting the soundsource line segments used a wrong algorithm to estimate the already processed combinations.

The soundsource combination panel now shows the segment color as background if the "Update track parameter" is enabled in trajectory output.

Bugfix, the pressure and temperature window were drawing to the wrong figure with multiple figures open.

The offsets get recalculated.

The warnings on loading the old interim file have been disabled to not
distract the user.

If an adjusted interim file exists, the current date and time is appended
to the filename.

Integrated the empiric_offset and empiric_drift parameter of the float, Changed copy offsets layout.

The measured soundspeed is now being updated on applying a status to temperature and pressure, as well as on loading an rfb file.

Bugfix, if the zoomed area does not contain any topographical lines, it will now produce a warning instead of an error.

The etopo file must be downloaded separately and linked as parameter
etopo in the files section in artoa.ini file.