Merge pull request #6 from psteinhoff/master

Added the Highpass flag to the python parameters GUI window
merged Yulia patch
removed /docs/build directory
fixed some problem with the TrackingParams that was caused by the conversion of Bool to Str or similar. For whatever reason the True in the Tracking Params was shown as a string rather than a Boolean.
removed the print statements
added explicit options to change the qt4 to wx and back by commenting out (TODO: find automatic identification of the working backend)
spaces instead of tabs
fixes the bug that causes sort grid to draw a -999, -999 crosses for the missing points
        x = [[i for i in x[0] if i > 0]]
        y = [[i for i in y[0] if i > 0]]
Merge branch 'fix_bug_sortgrid_crosses' into alexlib-master

Conflicts:
	docs/install_pyptv_ubuntu.md
	docs/source/index.txt
Merge branch 'fix_tracking_parameters_GUI' into alexlib-master

Conflicts:
	pyptv_gui/calibration_gui.py
	pyptv_gui/parameter_gui.py
	pyptv_gui/pyptv_gui.py
fixed the bug when more than one missing point in calibration sort grid
if more than one -999 in the list of sort grid, fixed.
made the removal of the -999 pythonic, thanks to http://effbot.org/zone/python-list.htm
Merge branch 'fix_bug_sortgrid_crosses' into alexlib-master

Conflicts:
	pyptv_gui/calibration_gui.py
no message
copied the documentation changes from jimmy516/clean2
fixed the length of the title PostPTV C-code
Merge pull request #13 from alexlib/fix_tracking_parameters_GUI

Fix tracking parameters gui
Merge pull request #16 from alexlib/origin-master

OpenPTV Documentation 0.0.04 Clean Branch - from Jimmy
fixed a bug in multimed.c