Added link to ongoing integration project in Pint.
Added thanks for the idea of Unicode superscript exponents and for the idea of a "pretty-print" format (more general than the "±" character format that it supersedes).
Refactoring of the formatting code so that users can modify part of it. Now,
the formatting of a common exponent can be customized.
More accurate and precise comment.
Added information about formatting customization in the docs.
More robust code (*explicit* avoidance of double parentheses during formatting).
Simpler code.
Grouping parentheses in formatting can now be customized too.
More explicit version history.
Switched to \left( and \right) for the LaTeX output because of the possibility of exponents inside the parentheses.
Missing pointer to the format customization documentation added.
Added tests, adapted LaTeX tests to the new \left( \right) grouping.
Fixed tests.
Prepared tests for the upcoming NaN LaTeX fix.
Added LaTeX priority test for NaN.
Added formatting option interaction test.
Fixed test.
Fixed test.
Fixed \mathrm{0.0000000).
Merge branch 'user_formatting'