Fix approach velocity for rangeTimeDiagram; Issue #782

[awirb]

according to issue #782 there was a problem if the avalanche ran beyond the field of view of the radar and hence the line of sight distance was not existent, so now in this case it is set to nan which caused a problem for the current way of computing the approach velocity, as all the values after timewise the max runout occurred are removed, this requires to convert the distance to the radar into a distance measured from top towards the radar

[qlty-cloud-legacy]

Code Climate has analyzed commit 382d2eb and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 73.3% (0.0% change).

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[codecov]

Codecov Report

Base: 75.32% // Head: 75.34% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (382d2eb) compared to base (06135d1).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 382d2eb differs from pull request most recent head fb37f36. Consider uploading reports for the commit fb37f36 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #786      +/-   ##
==========================================
+ Coverage   75.32%   75.34%   +0.02%     
==========================================
  Files          59       59              
  Lines       12555    12570      +15     
==========================================
+ Hits         9457     9471      +14     
- Misses       3098     3099       +1     

Impacted Files	Coverage Δ
avaframe/ana5Utils/distanceTimeAnalysis.py	83.58% <100.00%> (+0.75%)	⬆️
avaframe/out3Plot/outAIMEC.py	84.72% <0.00%> (-0.15%)	⬇️
avaframe/ana3AIMEC/aimecTools.py	81.74% <0.00%> (+0.03%)	⬆️

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