SiEIC geometry

This MR adds a visualization tool for SiEIC and is a reparameterization of the compact description, along with changes in the subsystems. The broad-strokes changes are as follows:

• Replaced muon subsystem with insensitive cylindrical yoke
• Increased minimum radius of calorimeter endcaps to make room for forward instrumentation
• Added mockup forward instrumentation

src/ConceptDetectors/SiEIC/bin/sieic_vis

+#!/usr/bin/env python2
+
+import argparse
+from array import array
+
+def run(args):
+    import ROOT, DDG4
+
+    kernel = DDG4.Kernel()
+    kernel.loadGeometry('file:' + args.compact_path)
+    dd = kernel.detectorDescription()
+    manager = dd.manager()
+    manager.CheckOverlaps(0.01)
+    manager.PrintOverlaps()
+    manager.SetVisDensity()
+    manager.SetVisLevel(2)
+    top_vol = manager.GetTopVolume()
+    top_vol.Draw('ogl')
+
+    viewer = ROOT.gPad.GetViewer3D()
+    viewer.SetCurrentCamera(ROOT.TGLViewer.kCameraOrthoZOY)
+
+    overlay = viewer.GetCameraOverlay()
+    overlay.SetOrthographicMode(ROOT.TGLCameraOverlay.kAxis)
+    overlay.SetShowOrthographic(True)
+
+    clip_set = viewer.GetClipSet()
+    clip_type = ROOT.TGLClip.kClipPlane
+    clip_set.SetClipType(clip_type)
+    clip_state = array('d')
+    clip_state.extend([1,0,0,0,0,0])
+    clip_set.SetClipState(clip_type, clip_state)
+
+    viewer.ToggleOrthoRotate()
+
+    if args.interactive:
+        ROOT.gApplication.Run()
+    else:
+        save_picture(viewer, args.output_prefix + '.png')
+        camera = viewer.CurrentCamera()
+        camera.RotateRad(-0.25, -0.4)
+        save_picture(viewer, args.output_prefix + '_angled.png')
+        overlay.SetShowOrthographic(False)
+        save_picture(viewer, args.output_prefix + '_angledNoOverlay.png')
+
+def save_picture(viewer, filename):
+    viewer.SavePictureUsingFBO(filename, 1920, 1080)
+    print("Saved file: " + filename)
+
+def define_args(parser):
+    parser.add_argument(
+            'compact_path',
+            metavar='CompactPath',
+            help='file with compact XML detector description'
+            )
+    parser.add_argument(
+            '-o', '--outputprefix',
+            dest='output_prefix',
+            default='sieic_vis',
+            help='output file prefix'
+            )
+    parser.add_argument(
+            '-i', '--interactive',
+            action='store_true',
+            dest='interactive',
+            help='run an interactive session.  Must quit ROOT application from the menu.'
+            )
+#    parser.add_argument(
+#            '-i', '--input',
+#            dest='input_file',
+#            default=None,
+#            help='truth-level input path'
+#            )
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description='sieic_vis')
+    define_args(parser)
+    args = parser.parse_args()
+    print(args)
+    run(args)
+