* `sff view --transform file.map` now outputs the image-to-physical space transform; `sff view file.map` will still
output
* user may choose how to display the transform
using `sff view --transform [--print-array (default) | --print-csv | --print-ssv] file.map`
* `sff convert` now takes an option `--image` that takes an `.map/.mrc/.rec` file and extracts the transform to set as
transform `0` ; excluding `--image <file.map>` produces a warning and possibly wrong transform `0`
* `sff notes [add|edit|del] [-x/--transform-id <int>] [-X/--transform <12-floats>] file.sff` to add/modify/delete
transforms
* `sff notes show -H file.sff` now displays the table of transforms
* all formats now honour `--image <file.map>` to set the correct transform
* `sfftk.readers.mapreader.compute_transform('file.map')` computes transform; when computing the transform from MAP
file, only reads the header
* all associated tests
* correct spelling for ångström
* minor cleanup and improvements
* bugfixes for cases not caught by tests e.g. merge annotation does not interact with transform_list - must be done
manually
* for map file we will not write skew and translation matrices; assume rectilinear lattices
* bugfix: `sff notes add` was always adding extra software
* bugfix: display of transforms when empty
* tests for edit and del of notes: OK
* incomplete updates to documentation
* including image used for testing transforms