Alfa qc

Added rules for generating ALFA output, for each sample separately and for all samples together. Closes #18 (closed).

envs/env_alfa.yaml

-name: alfa
-channels:
-  - biocomp
-  - conda-forge
-  - bioconda
-  - defaults
-dependencies:
-  - alfa=1.1.1
-  - rename=1.600