Remove use of glBindBufferRange

Fixes #10

Didn't work with some models. I'm guessing that there are requirements
for the offset (divisible by some power of 2 or something) that we just
happen to meet with some models but not with others.

New version binds the full output buffer but adds another buffer that
contains the offset into the output buffer.

See merge request !3

Fixes #10

Didn't work with some models. I'm guessing that there are requirements
for the offset (divisible by some power of 2 or something) that we just
happen to meet with some models but not with others.

New version binds the full output buffer but adds another buffer that
contains the offset into the output buffer.

Fixes #8

Fixes #5

Merge branch 'patchRender' of ssh://git.breab.org:2223/kai/Unterteilungsalgorithmen into patchRender

Conflicts:
	QTProject/subdivision.cpp

Conflicts:
	QTProject/mainwidget.cpp
	QTProject/subdivision.cpp

Merge branch 'patchRender' of ssh://git.breab.org:2223/kai/Unterteilungsalgorithmen into patchRender