FIX: remove side (too arbitrary)
Merge branch 'hotfix/remove-side-index' into develop
TST: update for removal of side
TST/CLN: import directly from unittest module
TST: add 2dmap tests
CLN: remove unused imports
CLN: shorten fused type name
BUG/TST: fix
CLN: remove print statements
CLN: import directly from unittest and use between as within
TST: remove uncovered and unused test code
DOC: update PandasTank docs
DOC: update documentation
DOC: add definition of weighted minkowski distance
DOC: add :
DOC: reword statement about vectors
CLN: remove unused imports
ENH: stupid optimization for _normalize
ENH: further micro-optimization
ENH: expose lower-level methods