Fix comment typo.

Change-Id: I8ebe3ad2a6efcf1797a2dc941994c7fc1e36f4bf
LOK: Add getPartName.

By default (i.e. for writer) we can just return an empty string,
and we only actually need to implement ITiledRenderable's
getPartName for components that actually support it (i.e. calc/impress).

Change-Id: I8b381e5d7a8000638b02f763b4bea8ef0226f8e0
LOK: add setPartMode.

This API seems to be simplest in the long run where we'll want to be
able to select between rendering slides/notes/both/embedded objects,
and maybe even adding the option of switching between continuous
and single page mode in writer (although I have no idea how hard
getting a single page mode out of writer would be).

Change-Id: I5bdfdb61854c37281c6992c8f3ed1c50c8aa0919
Remove horrifically outdated comment.

Change-Id: I1362489c9aecf536b31bf6ab57ad8c149f37a876
LOKDocView: add part name retrieval.

Change-Id: Iac31de0410d7f6187e5884152c329375047a23f4
gtktiledviewer: show part names in selector.

Change-Id: I02ae5b729f96e36b3f226218b32495907cb63cf3
Impress: Implement getPartName.

Change-Id: I614838505fef901fc37e8d3906bb59c60b034453