Lts-workflows

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* Change to use Ubuntu as base Docker image and removed LaTeX packages
* Removed Nextflow environment

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* Hotfix: remove versioneer from setup_requirements (issue 24)

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* Add setup requirements to install tagged lts-workflows version in docker image

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* Add options to snakemake_run (issue 23)

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* Minor changes to conda/meta.yaml
* Update docs
* Update development requirements
* Add snakemake utilities
* Add inconsolata fonts to docker
* CRLF to LF and Dockerfile organization
* Make conda builds with conda build-all (issue 22)
* Fix pytest mark for slow tests (issue 19)
* Add pytest entry point (issue 18)
* Add configfile option to pytest (issue 16)
* Redirect subprocess stderr to stdout and use stdout variable (issue 17)

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* Add docker base image and make it smallish (issue 3)
* Update docs