'**SUMMARY**
Load a calibration matrix from file.
The filename should be the stem of the calibration files names.
e.g. If the calibration files are MyWebcamIntrinsic.xml and MyWebcamDistortion.xml
then load the calibration file "MyWebcam"
**PARAMETERS**
* *filename* - The file name, without an extension, to which to save the calibration data.
**RETURNS**
Returns true if the file was loaded , false otherwise.
**EXAMPLE**
See :py:module:calibrate.py'

def loadCalibration(self, filename):

    retVal = False
    intrFName = (filename + 'Intrinsic.xml')
    self._calibMat = cv.Load(intrFName)
    distFName = (filename + 'Distortion.xml')
    self._distCoeff = cv.Load(distFName)
    if ((type(self._distCoeff) == cv.cvmat) and (type(self._calibMat) == cv.cvmat)):
        retVal = True
    return retVal
