Bug 724: Add manual unit test, incr. PNGImage verbosity.
PNGJ: Bump to git sha1 a0b1101ba2d37de39428ed55c8189502e24a3125 of https://code.google.com/p/pngj/
Bug 724: Testing PNG Transparency / Fixing GLSL Shader of test case: Mix texture alpha properly (pre-multiply), due to lack of ALPHA_BLENDING.
GLContext: Rename 2-digit VersionNumber statics aligning w/ all 3-digit names, e.g. Version31 -> Version310. ; Trim GLVersionNumber string.