add notToBeGreaterThan and notToBeLessThan

[robstoll]

moreover:

• make the distiction between toEqual and toBeEqualComparingTo clearer
• rewrite ComparableExpectationsSpec to new nameing and include test
  cases for toBeLessThanOrEqualTo and toBeGreaterThanOrEqualTo where
  the equals/compareTo contract is broken

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[codecov]

Codecov Report

Merging #878 (44cd5e0) into master (97d0133) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #878      +/-   ##
==========================================
+ Coverage   90.80%   90.82%   +0.01%     
==========================================
  Files         407      407              
  Lines        4046     4054       +8     
  Branches      211      211              
==========================================
+ Hits         3674     3682       +8     
  Misses        322      322              
  Partials       50       50              

Flag	Coverage Δ
bbc	83.89% <25.00%> (-0.17%)	⬇️
bc	83.79% <25.00%> (-0.17%)	⬇️
current	89.88% <100.00%> (+0.01%)	⬆️
current_windows	88.89% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...tutteli/atrium/api/fluent/en_GB/anyExpectations.kt	100.00% <ø> (ø)
.../tutteli/atrium/api/infix/en_GB/anyExpectations.kt	100.00% <ø> (ø)
.../atrium/api/fluent/en_GB/comparableExpectations.kt	100.00% <100.00%> (ø)
...i/atrium/api/infix/en_GB/comparableExpectations.kt	100.00% <100.00%> (ø)
...rated/kotlin/ch/tutteli/atrium/logic/comparable.kt	100.00% <100.00%> (ø)
...i/atrium/logic/impl/DefaultComparableAssertions.kt	100.00% <100.00%> (ø)

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