This patch addresses several issues:
1) At the beginning of the manual a section was rewritten, just after
"How to open a new log book", to explain to the newby what the
different options are for enetering dive data into the Subsurface
dive log.
2) A new section "A diver's introduction to CSV files" was written as
a boxed section.
3) The section dealing with CSV import from dive computers was
shortened because much of the information was transferred to
the new section in point 2) above.
4) The section dealing with CSV import from manually kept dive
logs was expanded, specifically giving more information
about import from manually kept dive logs in spreadsheets.
5) Appendix D was added, detailing CSV export from LibreOffice,
OpenOffice and Microsoft Excel.
Signed-off-by: willem ferguson <willemferguson@zoology.up.ac.za>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
