optimize default value for radius in CBA_fnc_addWaypoint etc.

[commy2]

When merged this pull request will:

• addWaypoint does "find waypoint position", which is somewhat like find safe pos dedmen
• that safe pos check is only done if radius is > 0 dedmen
• -1 disables the check, but always leads to the same result as 0, therefore use -1 as default instead