rewrite nvidia-detect

[Floris]

I made a rewrite of the nvidia-detect script.

- The script is compatible with sh, bash and dash.
- It is easy to add or remove supported Debian and NVIDIA versions.
- Use the -d switch to mimic a Debian version.
- support for multiple NVIDIA GPUs (or as PCI-ID on the command line)
- No new dependencies, only pciutils
- Try to detect NVIDIA Optimus (Unfortunately I doesn't have a device to  
test this)

I'm only scripting as a hobby, so feel free to correct and teach me new  
things!

Floris
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