Custom Contact Reference Select widget

In some use cases, eg selecting people from a list of 25 staff, an auto-reference field is difficult for non-tech savvy users since they don't know the appropriate values to key in. A select widget provides a more intuitive interface.

A possible downside with a select widget is performance if too many values can be used as options.

JMA is contributing code that provide a Select widget for Contact auto reference fields. In addition to filtering the contacts selectable by groups, an admin option allows the maximum number of select options to be set (eg 40).