_internalFormat for the texture format to read rather than default to GL_RGBA.
From Robert Osfield, changed the osg::Texture2D::copyTexImage2D and copyTexSubImage
code so that it set the _internalFormat to GL_RGBA if is is zero.
the text implementation to provide better speed, especially by using the
alignement to screen option.
Deprecated the Text::setFontSize(,) method, which is now being replaced
by setFontResolution(,)
Fixed typos in Texture*.cpp.
Removed old deprecated methods from osg headers.
checking for the validity of _image before doing checks on it. This breaks when
render to texture is used as there is no image to check against...
Added osgshadowtexture demo source. Demos still in development, so don't expect
any shadows yet...
initializes the array to the number of graphics contexts, and automatically
expands the array when indices outside the current size are required.
Added new osg::Texture::Extensions nested class to handle extensions on a per
context basis.
