gcoder.py reads the file content instead of the file name when testing

Previously, gcoder.py read not only the content of the file, but also it's
filename. This could have led to unexpected exceptions.

Added missing files to setup.py and fixed license notice in files which were not explicitly gplv3+.

If I install Printrun via setup.py, I don't have gcoder.py and I cannot even
use pronterface.py:

Traceback (most recent call last):
  File "/bin/pronterface.py", line 46, in <module>
    import pronsole
  File "/usr/bin/pronsole.py", line 23, in <module>
    from gcoder import GCode

So I've added this to setup.py.

Also, pronsole.ico is missing, added that to (not needed at runtime, but is
usefull for desktop files)

Conflicts:
	pronterface.py

added gcoder from another project. using gcoder to calculate dimensions and used filament

fixed measurement calculation for X and Y axis

Conflicts:

	pronsole.py

Add the GNU GPL text as the licese itselfs demands

GUI creation split

Fixed a bug on windows that caused find to fail by a few spaces.