Tooltip/ValidationTextBox error message: allow to specify position

[bill]

Many people have requested the ability to be able to control positioning of a tooltip / validation error message.

Think about doing this for 1.1.

Issues include:

• tooltip position should change from left to right depending on BIDI (right in western countries but left with hebrew or arabic scripts)

• tooltip position must change from bottom to top if there isn't enough room on the bottom

• a tooltip on the bottom (the natural position) is good in general but interferes with the drop down from a DateTextBox, FilteringSelect, DropDownButton. In that case would like to put the tooltip above and the drop down below, but that won't work if the control is positioned at the top of the viewport (possibly because the user scrolled the viewport)

• a Tooltip can be attached to multiple nodes, and perhaps you would want each node to have different positioning of the tooltip?

[bill]

(In [11817]) User defined tooltip positioning. Still needs more testing but basics are working. Tooltip positioning is specified via dijit.Tooltip.defaultPosition, and can be overrode on a per-tooltip basis by "position" parameter (or "tooltipPosition" on *TextBox? widgets). Fixes #5214.

[bill]

(In [11841]) Fix tooltip positioning the first time an "above" tooltip is shown. Refs #5214, #5406.

[bill]

(In [11890]) Fix exception positioning tooltip dialog, regression in [11841]. Refs #5214, fixes #5345.

[bill]

(In [11893]) Intermediate checkin to fix positioning of above/below tooltips positioned on right hand side of viewport. Aligns tooltip right-hand-side with target right-hand-side, and puts arrow near right. Also fixed rhino warnings in Button.js. Refs #5214.