Implement ICD calculations in planner output

This patch implements the calculation and printing of icd parameters
in the dive planner output. It does:
1) icd parameters are calculated following the rule-of-fifths for
   OC trimix dives. For each gas change on the ascent that involves
   helium, the change in gas composition as well as the change in
   partial pressures are shown. If rule-of-fifths is exceeded, a
   warning message is prinetd.
2) An independent function is provided that in principle enables
   calculation of icd paramaters outside of the context of the
   dive planner.

Further updates to icd calculations

These changes respond to #1047. Code style conventions have been
improved. The ICD table is now also printed when the planner is
set to verbatim mode. The code that created the html icd results
has been moved to a function. This does not make the code more
efficient (many parameters passed) but it makes the code more clean.

Free a new dynamic variable (old_gas_name)

Stylistic changes to new code in plannernotes.c

Changes in comments to explain some of the changes I made.
Preparation of comments and functioning of isobaric_counterdiffusion()
and its dependent data structure for possible transfer to dive.c
and dive.h after finalisation and merging of the present PR.
Smaller stylistic changes to conform to our coding rules.

The several comments and suggestions during github review
(@atdotde, @leolit123, @sfuchs79) are incorporated.

Fixed up mis-aligned comments and text descriptions by replacing
tab characters with space characters, thereby hard-forcing
alignment of indented lines of text.

Remove parameter *dive from function isobaric_counterdiffusion().

Improve a few constructs to conform to our style rules.

Signed-off-by: Willem Ferguson <willemferguson@zoology.up.ac.za>

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