[com1]: Update report com1

[awirb]

add info in com1DFA report that projected area and actual area are derived from the release raster and hence are an approximation of the polygon area (deviations are a function of mesh cell size)

PR Checklist

Please confirm before requesting review:

• I ran pytest locally without fails
• I added/updated tests where needed
• I updated documentation where needed

Confirm before the final merge/rebase into master

• Commits are sensibly squashed and rebased onto latest master
• Standardtest run without difference (with recompiled cython code)

[qltysh]

Coverage Impact

This PR will not change total coverage.

Modified Components (1)

Rating	Component	% Diff
	com1DFA	100.0%

Modified Files with Diff Coverage (1)

Rating	File	% Diff	Uncovered Line #s
	avaframe/com1DFA/com1DFA.py	100.0%
	Total	100.0%

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[fso42]

After discussion with MG and CT: Lets add the 'Model area' i.e. area from volume and release height to the log, but not the report yet.

-On ice, as the thickness may also be irregular.

[JuLa96]

See comment from @fso42 above