Looper

Added
- `--portable` flag to `looper report` to create a portable version of the html report
- `--lump-j` allows grouping samples into a defined number of jobs

Changed
- `--lumpn` is now `--lump-n`
- `--lump` is now `--lump-s`

Added
- `looper link` creates symlinks for results grouped by record_identifier. It requires pipestat to be configured. [72](https://github.com/pepkit/looper/issues/72)
- basic tab completion.

Changed
- looper now works with pipestat v0.6.0 and greater.
- `looper table`, `check` now use pipestat and therefore require pipestat configuration. [390](https://github.com/pepkit/looper/issues/390)
- changed how looper configures pipestat [411](https://github.com/pepkit/looper/issues/411)
- initializing pipeline interface also writes an example `output_schema.yaml` and `count_lines.sh` pipeline

Fixed
- filtering via attributes that are integers.