v0.7.0.0

• Added examples to the documentation of built-in functions and particles.
• Fixed some errors in the documentation.
• Fixed a bug in \binomial. Now it returns 0 when the second argument is negative.
• Fixed a bug in \factor. In earlier versions, it may return incorrect results.
• New particles: \concatMap, \fixedPoint, \onAny, \unconcatMap.

Breaking changes

• Some modules in the library are no longer exposed.
• The built-in function \normalForm is removed, because it is never used, and its semantics are not well-defined.
• The result of \divisors is now sorted.
• \intersect and \union are now multiset intersection and union.
• \bifurcate now works on numbers. If the input is a number, it is converted to the range from 0 to the number - 1.