#27 Read/Write PBM/PGM/PPM

[Brian Robb]

Perhaps you want to support PBM/PGM/PPM? (Portable
Bit/Gray/Pixel Map)

If you decide to do this, we can use my code for it.

It's a simple format though and I only really use it for
testing stuff, so you may not want it on the grounds
that it's clutter.

[Brian Robb]

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I can get it to read/write PGM and PPM okay (more or less)

I'll try and clean it up a bit more before perhaps submitting it
though.