6.03.00047 Bale collector/pathfinder fixes

- Bale collector fix for #6916: Check if object has an isa() function, no idea why
this is a problem with missions only.
- No off-field penalty if mission work is allowed #6917
- Turn radius fix for #6907:   Only call AIVehicleUtil.getMaxToolRadius() if
the implement has AIImplement specialization. No idea why this suddenly
a problem, we have been calling this for more than a year now...

modDesc.xml

@@ -1,6 +1,6 @@
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 <modDesc descVersion="47">
-	<version>6.03.00046</version>
+	<version>6.03.00047</version>
 	<author><![CDATA[Courseplay.devTeam]]></author>
 	<title><!-- en=English de=German fr=French es=Spanish ru=Russian pl=Polish it=Italian br=Brazilian-Portuguese cs=Chinese(Simplified) ct=Chinese(Traditional) cz=Czech nl=Netherlands hu=Hungary jp=Japanese kr=Korean pt=Portuguese ro=Romanian tr=Turkish -->
 		<en>CoursePlay SIX</en>