simple-hdf-server.py: Remove the 'all frames' mode, it will be incompatible with 2D grid subgroup output and was not a success anyway
lightsheet slice shader: Fix slice linear combination being applied in reverse
Change lightsheet group texture format from thin stripe to 2D grid

This will help with compatibility with platforms with MAX_TEXTURE_SIZE
as low as 2048 (e.g. many Macs).

I just hardcoded the row length to be 8 as that seems to be perfect
fit with our current resources and slice size 128x128.
HDF5IndexAndConvert: Fix the MongoDB collection name (Images -> images)
HDF5IndexAndConvert ConvertHDF5ToPNG(): Disable bogus Stat() check

The if condition is probably reversed as it triggers anytime but when
the file already exists. I'm just commenting it out, maybe Michael will
find a proper fix.
HDF5IndexAndConvert GetHDF5Autorectify(): Tidy up, add data by baseName rather than originalPath

That will allow me to easily re-run autorectification without re-importing everything.
Edited light-sheet loading bar
Merge branch 'master' into production

Conflicts:
	simple-hdf-server.py