New section "Iterating Over Compounds" to Assembly documentation.

[slobberingant]

Iterating over compounds like this has been a solution to a few of my previous problems and I haven't seen it in the documentation. Hope it helps.

[gumyr]

One minor change if you don't mind. The sum doesn't need the list comprehension, if its implemented as sum(part.volume for part in assembly3.solids()) it is called a generator expression and is the recommended way to do sums like this.

[slobberingant]

Feedback has been incorporated. Thank you.

[gumyr]

Thanks!