updated to v0.02
Merge remote-tracking branch 'antoine/help_files'
removed documentation for "mode" message

"mode" has replaced by "rectangle" for a long time.
it's of no use so people shouldn't use it.

also changed documentation of "YUV" mode
first try at mipmap support for pix_texture
glew-check whether mipmap is supported

according to `glewinfo`, the glGenerateMipmap() is part of the
 GL_ARB_framebuffer_object extension.
 so we use that to set the m_canMipmap in isRunnable(), and && with the
 other conditions (!isRectangle) to determine whether we really want to
 use mipmapping.
 since this knowledge is no longer part of the interal object state,
 we have to pass the "doMipmap" explicitely to setTexFilters()
fixed typo

m_canMipMap -> m_canMipmap
allow querying the size of the various arrays
only so automatic smoothing if there are no normals (yet)

for compatibilities sake, [model] should do smoothing (0.5), even
if the user did not request it explicitely.
otoh, if the model already contains normals information, we probably
don't want that.
so we only apply an auto-smooth if the model doesn't yet have any normals.
fixed canvas-sizes and alignments