Qbatch

- fix python2 unicode support
- remove unneeded dependencies

- Fix log file naming for Slurm non-array jobs
- Add CITATION.cff file
- Update setup.py to fix description on PyPi
- Chunk size can now be unlimited, set size "0" to have unlimited chunk
- Fix workdir vs chdir for old vs new Slurm by using the short "-D" option instead
- Implement container mode for generating jobs to be parsed by external qbatch generated by internal qbatch within a container.

Bugfixes
- fix SLURM job search returning wrong result when no jobs
- fix UNICODE support in python2 for environment variables

Bugfixes:
- Accidental embedding of quotes into squeue listing broke SLURM dependencies

A few bugs fixed after some testing of a new deployment c/o egarza

- always check for parallel before submitting jobs
- explicitly embed the shell as part of the job commands os that posix_compliant job starting on Torque/PBS/SGE will use the right shell, in cases where the default shell is ``/bin/csh``

Fix dependency specification on SLURM