root resizing in qt2

[tzaeschke]

Root resizing after insert() in QT2 may cause root node to be too small. See #42 .

[codecov]

Codecov Report

Attention: Patch coverage is 71.62162% with 21 lines in your changes missing coverage. Please review.

Project coverage is 75.21%. Comparing base (fc9e7fd) to head (538302e).
Report is 1 commits behind head on master.

❗ Current head 538302e differs from pull request most recent head 8c0e2ec

Please upload reports for the commit 8c0e2ec to get more accurate results.

Files	Patch %	Lines
...ain/java/org/tinspin/index/qthypercube2/QNode.java	58.33%	17 Missing and 3 partials ⚠️
...va/org/tinspin/index/qthypercube2/QuadTreeKD2.java	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #43      +/-   ##
============================================
+ Coverage     74.77%   75.21%   +0.43%     
- Complexity     2084     2123      +39     
============================================
  Files            76       77       +1     
  Lines          8061     8110      +49     
  Branches       1576     1585       +9     
============================================
+ Hits           6028     6100      +72     
+ Misses         1644     1613      -31     
- Partials        389      397       +8     

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