Nef-pipelines

- fit ratio requires a noise level
- add a deep neural network peak list importer

- fixed bugs
- tree lib not included in requirements
- Strenum imported from python stdlib enum not strenum

- support for the NEF relaxation data draft proposal
- output of data to modelfree
- minor bug fixes

- add support for reading shiftx2 shifts [alpha]

- add display of python executable path to about --verbose
- unassign can be filtered by chains and residue ranges
- improvements to nmrstar project and shift reader which can
* work with multiple lists of shifts
* work with multiple sequences
- frame clone and remove get a --input option and pipe functions
- add a globals command to set global values through a pipe and save to clean up control frame correctly
this allows you to use global setting of the --force option with mars
- updates to mars output transcoders: they now has a pipe function and checs for file overwriting
and have a force option
- mars can now ouput assigned shifts and fixed assignment restraints
- mars output now includes assigned fragments using the ccpn syntax
- fixed a bug where multi line strings were not being parsed correctly

- added ability to unassign residue ranges in nef frames
- better reporting of errors from reading chemical shift frames
- add missing dependency on runstat