Contact Search Widget additional [View Contact] button control

Taken from posting http://forum.civicrm.org/index.php/topic,1648.0.html

A usability improvement for quickly viewing a contacts records. Currently while using the search widget users are forced to first search the contact database and display a listing of the found contacts before they can action a view contact details. Often a single contact will be shown in the listing.

An additional button next to the [Search] button called [View Contact] would streamline the process for many users.

If possible, we should make "View Contact" the default button action when the Enter key is pressed IF the comboBox contains an exact match contact record. (http://forum.civicrm.org/index.php/topic,2247.msg11633.html#msg11633)

There is some logic required here too. If more than one contact is found with the same search string then either the button is greyed out or takes the user to the contact listings screen first. Also if no contacts are found a search should be triggered.

For very large contact databases it may be desirable to be able to disable the button in global config.