All our classes should have the Maemo prefix because we don't have
a namespace of our own.

Reviewed-by: ck

Reduces the minimum size of the Options dialog.

Reviewed-by: kh1

  * Use id() for methods returning a string used to represent
    some type of object.
  * Use displayName() for strings that are meant to be user
    visible.
  * Quieten some warnings while touching the files anyway.
  * Move Factories to their products in the plugins where that
    was not done before.

Reviewed-by: dt