other minor changes

these arguments are most likely typos

if two output variables are devined, unknown arguments are still returned as the second one

delete old arc functions (all by zillekens (2013)

modified the step-wise example to be of the same format

Ein Münchener Homie hat mir geschrieben, dass er Probleme beim plotten der Loudness hatte.
Das Problem ist, dass itaResult.plotAxesProperties wohl nicht mehr ausgelesen wird ( oder zumindest das Argument xscale).
Ich hatte das jetzt auf die schnelle so gefixed (siehe unten), aber ihr habe da ja vielleicht irgendwo einen tollen neuen Weg um das zu machen....

-boundary groups and polygons can now be accessed from outside (read-only)

-added functions to set scatter model (ray tracing) and sampling rate (filter synthesis)

-fixed the default transform from openGL to Matlab in the plotModel() method
-now also uses given transform for receivers and sources instead of hard-coded one

-now telling matlab to work with row vectors when using cross()
-removed the usage of normr
   -normr is part of Neural Network Toolbox in newer Matlab versions
   -normalization is already in in ita_vu2quat()

-added static function to create itaOrientation from view and up vectors
ita_vu2quat
-bugfix: result was wrong when using 3x3 matrices as input

- equation based reverb time calculation now calculates the factor (~0.16) according to environmental parameters
- improved material characteristics plots (markers, output quality of pngs)

- added documentation (method descriptions)
- code formatting (indenting)

- changed default plotModel color for wireframe model

added arg 'axes_handle' for itaHRTF.plot_ITD

its not exactly stable and will give up at the poles if multiple points are defined

Avoids writing MATLAB's global pathdef.m. Also fixes issue introduced in 743096db