Overlaps in RBend in fieldmaps branch

[Jochem Snuverink]

There are overlaps for RBends with their next drift in the fieldmaps branch:

e.g. Component-RBend test from http://abp-cdash.web.cern.ch/abp-cdash/testDetails.php?test=130216&build=29304

-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : GeomVol1002
      issued by : G4PVPlacement::CheckOverlaps()
Overlap with volume already placed !
          Overlap is detected for volume d2_0_pv
          with rb1_0_pv volume's
          local point (-19.686,-6.70744,247.921), overlapping by at least: 1.97519 mm 
NOTE: Reached maximum fixed number -1- of overlaps reports for this volume !
*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------

[Laurie Nevay]

Fixed with commit #28bad5f.

Error in sign specific to rbends in component factory caused the beam pipe on the outgoing side of an rbend to be bent the wrong way.