generate-XS.pl should output intermediate results

[devel-chm]

This would allow for offline debugging and implementations of new features. Ideally we would output the signatures data base in a form that could be loaded into perl directly for additional processing.

[devel-chm]

Using Data::Dump at the moment but the output needs to go to a file which is added as a dependency to the makefile. Need to look into using Data::Dump::Filter to make the signature output human readable: aligning columns, whitespace, ...

[mohawk2]

This should probably go into the OpenGL::Config that I aim to put out Real Soon Now[tm]. This would support my aim to increase the amount of "transparent computing".