tracediff: Honour --call-nos option.
glretrace: Swizzle uniform block indices.

This may be necessary even when replaying with the same driver used
while tracing, but a shader is edited in qapitrace causing an uniform
block to become inactive.
glretrace: Remove assert in dumpProgramUniforms.

As it can be triggered by some OpenGL drivers.
gltrace: Add a link to Mesa's glGetBufferParameteriv fix.

For reference.