maybe nitpicky, but I think it's more correct. changed 'and' to 'or'.
added commas, and made some minor wording changes.
edited sentences (and a paragraph break) for clarity.

Some parts in here, I had to reread the text a couple times to make
sure I understood. I think it is clearer the way I've changed it.
Prevent crash on startup. Preliminary fix! I still need to actually reproduce original crash!
https://github.com/darktable-org/darktable/pull/548#issuecomment-42763922
Merge pull request #557 from Terrycloth/clarifying-text-in-user-manual

my first few edits to the user manual.
usermanual: more on tagging (thanks to Christian Kanzian)
Revert "Prevent crash on startup. Preliminary fix! I still need to actually reproduce original crash!"

This reverts commit f6129f8a352dd99037d98d5f8c51680ffb889ada.
Preset update infrastructure: some modules(e.g. lens iop) depend on global data in reload_defaults()

module->init(module); is already called by dt_iop_load_module_by_so()
Lens IOP: prevent crashes in legacy presets update infrastructure
update to LibRaw 0.16.0, load x-trans images

- Use LibRaw 0.16.0 to load x-trans images
- LibRaw >= 1.15.0 no longer allows document_mode (which returned
  grayscale uninterpolated data), hence now receive multi-channel
  data then copy it to dt single-channel mosaic format
- Cull unneeded libraw parameters which pertain to output.
- Libraw scales colors and subtracts black point, so no need to do this
  in dt_imageio_open_raw()
- For x-trans images, on image load orient/shift the mosaic pattern
  depending on orientation & usable image area.
- No longer blacklist x-trans raw files
fast downsampling to demosaic x-trans images
linear demosaic for x-trans files
highlights module for x-trans
temperature iop for x-trans
hotpixels for xtrans
raw denoise for x-trans

Use per-channel nearest-neighbor interpolation rather than downsizing
the channel.
invert module for x-trans

Also flip roi_in x/y for some bayer cases and don't divide by
0xffff in bayer float case (typos?).
disable ca correct module for x-trans
x-trans camera data

- white balance presets for x100s
- measured fujifilm x100s basecurve
- selectively update coeffs for x-trans sensors
- DMC-GH1 aspect ratio for comparison testing

All coefficients from dcraw 9.20 except for Fujifilm X-T1 camera matrix
from dcraw 9.21. Adding by hand as auto-generation via update_dcraw.sh
seems to produce unusable file (c.f. capitalization problems).
disable green-matching in demosaic for x-trans