Design/Whiteboards/Creating breaks

Summary
Make creating page, section, and column breaks easier to discover.

Definition of Terms

 * Section: A block of text within a page with formatting separate from that of the page that contains it. It's useful for separating a block of text into columns, adding different margins, a different background, different footnotes and endnotes, and hiding or write-protecting text.

Discussion
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Personas

 * Susan: 21-year-old college student. Hates hunting for features, always uses only the UI elements she notices up front. So far, she has used line breaks (pushing "Enter") to sepearate pages.
 * Andrew: likes to keep his papers nice and organized with sections, but hates looking through complicated menus and dialogs.

Page and section add buttons
Buttons for creating a page break and a section break appear below the last page of the document.

Column breaks
With "Evenly distribute text" disabled, column breaks should be automatically created along with the columns, so tapping within a column will focus the cursor at the beginning of the column.

Page and section add buttons
Buttons for creating a page break and a section break appear below the page of a document.