RivuletExpDataProcessing changelog 08.03.2013

rivuletProcessing.m
- added calculation of the apparent contact angles as function of the
  plate length coordinate. There is 1/4 of the left and right side of
  the rivulet, then the first order (with error of O(h)) derivative of
  these parts of the profile are calculated, 10 maximal values are found
  and the apparent contact angle is obtained as atan(mean(these 10
  values)). for another info and possibility of the control plots, see
  the RivSurf subfunction of the rivuletProcessing code.
  these variables (thetaApL and thetaApR) are of the same kind as for
  example RivWidth, mSpeed, RivHeight... and are exported in 'Other'
  subfolder of the chosen data storage folder