Fixed bugs testing point/line point/polygon intersections.

Change-Id: Iaf421b20796fd2ace76d09c09d78b7a4657331c2
Added support for non-column key sets in setColumnKeySources().

Change-Id: I280eba2fa02251be4e65b97b7b4d194cd9868088
Line chart now supports probing/selecting points in grouped mode. Added
foreign key type override.

Change-Id: I1b01b9edaef9da2456909549168bcc807a2da1e0