Fixed moveTo bugs

It is no longer possible to move to a region where end > chromosomeSize
It is no longer possible to perform a moveTo action, and then exceed the max/min left scrolling limits
Fixed bug with image positioning

Always need to set scrollContainer left to 0 in makeFirstImage
Bug could be achieved by:
  Click one chromosome band in the karyotype
  Click a second band
  Click the first band again
  Scroll a bit (either direction)
  Click the second band again

  The image you see now does not correspond to the start and stop position - it is offset by the amount you scrolled