message: fix TypeError when specifying compose_megapix
  without rounding the composed image sizes (variable "sz") they will be odly fractions of a pixel (e.g. (5300.965, 3772.897)) and therefore cause a "TypeError: integer argument expected, got float" in line
  456        roi = warper.warpRoi(sz, K, cameras[i].R)
diff: @@ -450,7 +450,8 @@ def main():
  cameras[i].focal *= compose_work_aspect
  cameras[i].ppx *= compose_work_aspect
  cameras[i].ppy *= compose_work_aspect
  - sz = (full_img_sizes[i][0] * compose_scale, full_img_sizes[i][1] * compose_scale)
  + sz = (int(round(full_img_sizes[i][0] * compose_scale)),
  + int(round(full_img_sizes[i][1] * compose_scale)))
  K = cameras[i].K().astype(np.float32)
  roi = warper.warpRoi(sz, K, cameras[i].R)
  corners.append(roi[0:2])
  