update check-calibration
Update documentation for check calib
bug in recalib fixed
Update doc for calib
again typos corrected
optparse -> argparse.
related to issue #83
new image with benchmarks
updated documentation
work on doc
a bit documentation on how calibration works
Dead lock issue in distortion.uncorrect
related to issue #83
switch diff_tomo to ArgParser
related to issue #83
related to issue #83
Merge remote-tracking branch 'upstream/master'

Conflicts:
	doc/source/calibration.rst
adding documentation