Harmonize jQueryUI ThemeRoller with Bootstrap themes

Several features in Tiki are themed via jQuery UI ThemeRoller, and we have a jQueryUI theme picker, which is distinct from the global Tiki theme picker.

• http://arshaw.com/fullcalendar/docs/display/theme/
• Spreadsheet
• etc.

This was a problem before Bootstrap, and we need to find a way to address this.

Related links

• https://addyosmani.com/blog/jquery-ui-bootstrap/
• http://www.pontikis.net/blog/jquery-ui-bootstrap-ui-button-icon-secondary