new data for themes in dance music

I have added two pages to a set that focuses on theme types as they can be described using William Caplin's terminology. The first gathers information from the other pages according to theme type: Examples of theme types. The second supplies data for 8 collections by Beethoven, 1 by Czerny, 9 by Hummel, and 1 each by Marschner and Weber: Themes Tables.