DivisionsExplained

In addition to the normal (:div:)...(:divend:), one can also
suffix "div" with a number to indicate a specific div to be
opened or closed.  For example (indentation shown for clarity):

    (:div:)           <div>                start a new div
    abc                 <p>abc</p>
    (:div1:)            <div>              start a (nested) div1
    def                   <p>def</p>
    (:div1:)            </div><div>        close prev div1, start new div1
    ghi                   <p>ghi</p>
    (:div1end:)         </div>             close prev div1
    jkl                 <p>jkl</p>
    (:divend:)        </div>               close div

Any sequence of digits can be used to distinguish one div from another.
The digits don't imply any sort of ordering relationship -- they're
simply used to match up opening and closing div tags.  For example,
each of the following columns all output the same results:

    (:div1:)            (:div3:)          (:div2:)
    (:div2:)            (:div2:)          (:div1:)
    (:div3:)            (:div1:)          (:div3:)
       text                text              text
    (:div3end:)         (:div1end:)       (:div3end:)
    (:div2end:)         (:div2end:)       (:div1end:)
    (:div1end:)         (:div3end:)       (:div2end:)

Closing a div automatically closes any nested divs that were started
inside of it.