generate datasets with recipes from provided `STEPS` env

See #207, release log:

• 869cb82 by @h1alexbel: feat(#207): puzzle
• 39406d5 by @h1alexbel: feat(#207): read last too
• 1fe4a0a by @h1alexbel: feat(#207): echo debug
• 70ec1f5 by @h1alexbel: feat(#207): typo
• 6d387c9 by @h1alexbel: feat(#207): STEPS, NUMBASE
• ad8848e by @h1alexbel: feat(#207): passes
• ec83fbb by @h1alexbel: feat(#207): pipeline.json
• f127c40 by @h1alexbel: feat(#207): /root/.cargo/bin w...
• 00313db by @h1alexbel: feat(#207): extras
• faa1a6e by @h1alexbel: feat(#207): STEPS
• 5dc235a by @h1alexbel: feat(#207): files
• 05b0788 by @h1alexbel: feat(#207): numbase
• 146a6ec by @h1alexbel: feat(#207): out files
• 8c06278 by @h1alexbel: feat(#207): pipes
• 1312b03 by @h1alexbel: feat(#207): no envs parsing
• ee52f75 by @h1alexbel: feat(#207): prefix
• a7a493c by @h1alexbel: feat(#207): pipeline.txt
• 2620c5d by @h1alexbel: feat(#207): lout
• 52c36e5 by @h1alexbel: feat(#207): naive
• 855a4a3 by @h1alexbel: feat(#207): pipeline
• and 83 more...

Released by Rultor 2.0-SNAPSHOT, see build log