fix261 -- fixes inverted x-axis problem

[RalphSteinhagen]

fixes wrong label overlap detection that prevented inverted x-axes (see #261)

[milo-gsi]

LGTM

ErrorDataSetRendererStylingSample works for me now.

[codecov]

Codecov Report

Merging #262 into master will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #262      +/-   ##
============================================
+ Coverage     47.54%   47.55%   +0.01%     
- Complexity     5570     5574       +4     
============================================
  Files           341      341              
  Lines         34843    34843              
  Branches       5700     5701       +1     
============================================
+ Hits          16565    16571       +6     
+ Misses        17232    17230       -2     
+ Partials       1046     1042       -4     

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/de/gsi/chart/axes/spi/AbstractAxis.java	58.41% <0.00%> (-0.17%)	129.00 <0.00> (ø)
...art/src/main/java/de/gsi/chart/plugins/Zoomer.java	23.63% <0.00%> (+0.08%)	21.00 <0.00> (ø)
...hart/plugins/measurements/DataSetMeasurements.java	75.77% <0.00%> (+0.34%)	153.00% <0.00%> (+2.00%)
...main/java/de/gsi/chart/ui/HiddenSidesPaneSkin.java	43.54% <0.00%> (+0.47%)	29.00% <0.00%> (+1.00%)
...ava/de/gsi/chart/utils/SimplePerformanceMeter.java	88.70% <0.00%> (+1.61%)	31.00% <0.00%> (ø%)
...in/java/de/gsi/dataset/event/EventRateLimiter.java	98.14% <0.00%> (+1.85%)	14.00% <0.00%> (+1.00%)

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