Updates to user manual

[Willem Ferguson]

Recently I submitted a patch with updates to the user manual. Included 
in that was a section dealing with the dive planner. It now appears that 
the visibility of the planner was just a glitch and that V4.1 will not 
have the planner.

I suggest push that patch to the manual.

I have several small changes to be made to the manual, reflected in 
discussions on this message board. I will submit an additional patch 
that will, amongst others, remove the text for the planner. (Anton and 
Robert, I will not throw away that text so we will have the option to 
use it as a basis for documentation later on).

Is this solution workable?

Kind regards,
willemf