Improving H1D legend style - 2

[rmadar]

PR following #689 (fixes #683)

[rmadar]

OK I have simplified the legend and gave priority according to the following rules:

• with fill: boxline and markers but disregard band
• w/o fill: skyline, band and markers

If you think the last one is too crowded, we can also remove the marker when the histo is filled (I don't have a strong opinion here - and this setup shouldn't be used I think).

I'll update the *_golden.png files once we settle on the legend choice.

[sbinet]

it looks fine.
and we can always adapt a bit after some experience has been gained.

thanks.

[codecov-io]

Codecov Report

Merging #703 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #703      +/-   ##
==========================================
+ Coverage   70.35%   70.36%   +0.01%     
==========================================
  Files         359      359              
  Lines       46339    46365      +26     
==========================================
+ Hits        32600    32626      +26     
  Misses      11520    11520              
  Partials     2219     2219              

Impacted Files	Coverage Δ
hplot/h1d.go	93.25% <100.00%> (+0.58%)	⬆️

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