`x.ui.layout_column_wrap` width API

The current documentation for this function says that it takes a fractional width between 0-1, but it actually seems to require the following:

1. Between 0.05-1
2. Divides 1 into equal portions with no remainder

I think the current API is confusing because we're really asking the user to provide an integer of the number of divisions, but asking for the reciprocal of that number. This fractional expectation makes the user think that any fraction should work, but it doesn't and produces really confusing cases. For example 0.3333333333333333 is a valid width but 0.333333333333333 is not because three times the former rounds to 1, while the latter does not.

A couple of things which might help:

1. If width is omitted it should evenly divide the number of children
   2a) User should supply number of divisions instead of the fraction
   2b) Allow both and take the reciprocal of numbers greater than 1

Start with the documentation and implementation of x.ui.layout_column_wrap, then verify the documented width range and division behavior described in the issue. Resolve whether omitted width, a number-of-divisions API, reciprocal handling, or a combination is wanted before defining the changed behavior and updating its documentation and tests.