Appion

Appears to getting negative number in square root calculation

Traceback (most recent call last):
  File "/home/acheng/myami/appion/bin/imageloader.py", line 6, in <module>
    app.run()
  File "/home/acheng/myami/appion/appionlib/apImageUpload.py", line 289, in run
    self._printSummary()
  File "/home/acheng/myami/appion/appionlib/appionLoop2.py", line 677, in _printSummary
    timestdev = math.sqrt(float(count*timesumsq - timesum**2) / float(count*(count-1)))
ValueError: math domain error

works.