Add statement filter

[davidmoten]

Addresses #4

No automated selection (optimizing r² for example) yet.

[codecov-io]

Codecov Report

Merging #5 into master will decrease coverage by 0.11%. The diff coverage is 14.76%.

@@             Coverage Diff              @@
##             master       #5      +/-   ##
============================================
- Coverage     17.76%   17.64%   -0.12%     
- Complexity      438      441       +3     
============================================
  Files            98      100       +2     
  Lines          6857     6947      +90     
  Branches        884      891       +7     
============================================
+ Hits           1218     1226       +8     
- Misses         5528     5610      +82     
  Partials        111      111

Impacted Files	Coverage Δ	Complexity Δ
...m/github/deliberateq/qsort/gui/DataGraphPanel.java	0% <0%> (ø)	0 <0> (ø)	:arrow_down:
.../github/deliberateq/qsort/gui/StatementsPanel.java	0% <0%> (ø)	0 <0> (?)
...ava/com/github/deliberateq/qsort/gui/DataTree.java	0% <0%> (ø)	0 <0> (ø)	:arrow_down:
.../java/com/github/deliberateq/qsort/gui/Events.java	0% <0%> (ø)	0 <0> (ø)	:arrow_down:
...m/github/deliberateq/util/math/gui/GraphPanel.java	0% <0%> (ø)	0 <0> (ø)	:arrow_down:
...va/com/github/deliberateq/qsort/gui/DataPanel.java	0% <0%> (ø)	0 <0> (ø)	:arrow_down:
...va/com/github/deliberateq/qsort/gui/MainFrame.java	0% <0%> (ø)	0 <0> (ø)	:arrow_down:
...ithub/deliberateq/qsort/gui/ParticipantsPanel.java	0% <0%> (ø)	0 <0> (ø)	:arrow_down:
...va/com/github/deliberateq/qsort/DataSelection.java	66.66% <100%> (ø)	3 <2> (ø)	:arrow_down:
...c/main/java/com/github/deliberateq/qsort/Data.java	36.69% <40%> (+0.56%)	50 <3> (+1)	:arrow_up:
... and 4 more

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