Split buffer in three, one per color (as OpenGL guarantees that one can at least have 8 SSBOs), to allow three times larger images. Also make it possible to ignore maximum buffer size reported by the driver.

The maximum buffer size limitation is rather strict on radeonsi, so I decided to split the buffer in three, effectively increasing the maximum image size by a factor of three.
While doing so I realized that at least on radeonsi the reported maximum buffer size seems to be off. For this reason I added a new command line switch, that allows to ignore the maximum buffer size check.
For those curious: radeonsi reports a maximum buffer size of 128 MB, but I had no problems when using three buffers of 1098 MB each.

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