Improve integration with dojo.data

[rnucera]

Eliminate grid.model if possible, talk to dojo.data directly.

[BryanForbes]

(In [13518]) refs #6546, !strict

• Added DataGrid? which binds directly to dojo.data.
• Added DataGrid? test file.
• Fixed DojoData? model resetting the scroll position on sorting.

[BryanForbes]

(In [13545]) !strict refs #6546

• Added initial dojo.data notification support (only onSet supported for now).

refs #6353

• Moved dojox.grid._grid.GridView? to dojox.grid._View (also moved template to resources/View.html).
• Moved dojox.grid._grid.Views to dojox.grid._ViewManager.
• Moved dojox.grid._grid.builder classes to private classes in _View.js.
• Moved functions from dojox.grid.lib that are only used in _View.js to private functions in _View.js.
• Updated tests accordingly.

[BryanForbes]

(In [13595]) refs #6546 !strict

• Added onNew and onDelete support to DataGrid?.
• Changed DataGrid? test to use ItemFileWriteStore?.

[BryanForbes]

(In [13818]) refs #6546 !strict

• Removed dojox.grid.Grid (DataGrid? replaces it).
• Removed _data directory.
• Updated tests to reflect the changes.

refs #6545

• Updated layout parser to support different combinations of view and cell definitions.

[BryanForbes]

(In [13832]) refs #6353, refs #6546 !strict

• Changed "[mM]odel" to "[sS]tore" in DataGrid?.
• Updated tests and QueryReadStore? demo to reflect change.
• Made sure all tests work in IE7.

[BryanForbes]

(In [13845]) refs #6546 !strict

• Added DataSelection? to return items from DataGrid?'s selection.
• Updated Yahoo! search example to use ServiceStore?.

[BryanForbes]

(In [13860]) refs #6546 !strict

• Switched order of arguments to get and format so plain _Grid's don't have a null first argument.