Modified some ATK/AT-SPI mappings based on last call comments.

In Dec 2013l, we delayed making these changes until the 1.1 time
frame:
- comment 429: added OPTIONAL to emitting a "focus:" event (4.1 Focus States and Events Table).
- comment 431: for banner role, added ROLE_LANDMARK.
- comment 435: for listbox role, changed to ROLE_LIST_BOX (was ROLE_LIST).
- comment 436: for log role, added ROLE_LOG.
- comment 437: for marquee role, changed to ROLE_MARQUEE (was ROLE_ANIMATION).
- comment 438: for math role, changed to ROLE_MATH (was ROLE_UNKNOWN).
- comment 440: for navigation role, added ROLE_LANDMARK.
- comment 441: for note role, changed to ROLE_COMMENT.
- comment 442: for radiogroup role, changed to ROLE_GROUPING (was ROLE_PANEL).
- comment 443: for row role, changed to ROLE_TABLE_ROW (was ROLE_LIST_ITEM).
- comment 444: for time role, changed to ROLE_TIMER (was ROLE_UNKNOWN).
- comment 445: for treeitem role, changed to ROLE_TREE_ITEM (was ROLE_LIST_ITEM).