Nef-pipelines

added missing test files

added support for import of RDCs from a csv file

added support for segment codes to pales / dc when exporting rdcs

added support for exporting neff rdc restraints to xplor legacy format

supports reading xplor distance restraints [but currently only single atom selections]

adds xplor nih dihedral restraints

read sequences from xplor psf files

minor improvements to help text and error messages

note: the xplor support includes a proper parser for xplor nested restraint selections
including SEGIDentifier RESIDue and NAME including proper literal abbreviations.

The `nef test` command is once again available.

A reliance on caching stdin was removed

There were no changes in the tools and transcoders provided in this release,
other than the test subcommand, as this release was focused on testing.

Initial release to pypi with changes for better compatability with windows and
linux

The `nef test` command was disabled for this release as pytest and the tests
were not working well with the pyscaffold based release pipeline.

There were no changes in the tools and transcoders provided in this release,
as this release was mostly about removing technical debt

initial version which supports the following (to some extents; note the beta designation)

tools

- listing renaming and cloning molecular chains
- deleting, inserting, listing and pretty printin (tabulate) save-frames
- producing a NEF header with correct UUID
- streaming nef files into a pipeline
- testing itself

transcoders
- __fasta__
- sequence [read and write]
- __mars__
- shifts [write]
- __nmrpipe__
- sequences [read]
- shifts [read]
- peaks [read]
- __nmrview__ / __nmrfx__
- peaks [read and write]
- sequence [read]
- shifts [read]
- __pales__
- rdc restraints [write]
- rdc restraints template [write]
- __pdb__
- sequence [read]