fix: Makefile install-develops with wrong version number
merge tests/ from develop
merge Makefile from hotfix
merged intervaltree/ from hotfix
merging CHANGELOG, Makefile and setup.py from hotfix
whitespace in changelog [ci skip]
spelling Konstantin Tretyakov [ci skip]
add: features from 2.0.0
version bump to 1.2.0
rm: vestigial Interval.sorted() calls, replaced with sorted()
ws only [ci skip]
rm: test_basic_structuring() since it's been superceded by a test in optimality_test.py
rm: bind_test_function() from OptimalityTestMatrix
ws only [ci skip]
fix: installing from testpypi requires --pre flag
upd: changelog [ci skip]
fix: overlaps() returned None instead of False
edit: changelog wording [ci skip]
add: IntervalTree.empty()
add: emptying tests