Added "Lucky" functionnality to FlexiContent Advance Search Module

Hi, 
i made this to answer a request on FlexiContent's Forum.

It adds the possibiliy to add a "Direct" button near the "Go" button.
If pressed, this button go directly to the first item found, like the "I'm feeling lucky" button on Google.

NOTE : I'm beginner on GitHub, sorry for the useless commits (5bd7c5d, 2195c73 & bfdccc3)