Fix problems with vertex program protocol

Fix problems with vertex program protocol

There were two sets of bugs in the vertex program (ARB and NV)
protocol.  First, several of the ARB functions were missing the
'doubles_in_order="true"' annotation.  Second, after the ARB decided
that glVertexAttrib*ARB functions must not alias fixed-function state
for GLSL, Nvidia re-assigned GLX protocol opcodes for
glVertexAttrib*NV (circa Septeber 2004).  For some reason gl_API.xml
was never updated to reflect this, and the updated version of the
GL_NV_vertex_program spec never made into the registry.