Fix bug in cacheSensorOrdering() function
Fix bug in cacheSensorOrdering() function

This solve the issue #432.
Now, external sensors are NOT placed on the fix base link of the BerdyModel only in case of both BERDY_ORIGINAL_FIXED_BASE == true and includeFixedBaseExternalWrench == false.
robotology/idyntree,robotology/idyntree,robotology/idyntree,robotology/idyntree,robotology/idyntree