Rnajena-sugar

* core:
- add sort, filter and groupby methods to FeatureList and BioBasket
- BioSeq.match: rename orf option to rf, allow tuple-like arguments
- consequently rename BioSeq.meta.features to BioSeq.meta.fts
- add BioBasket.fts attribute, add add_fts method for BioSeq and BioBasket
- move all str methods to BioSeq.str and BioBasket.str namespace
- new class LocationTuple used internally for Feature.locs
- introduce BioSeq.sl and BioBasket.sl methods and options for slices
(gap, inplace, update_fts)
- refactor Defect code
* cane:
- add sugar.core.cane module with seq and ft tools
- add ORF finding functions and methods
- add final_stop parameter in translate
* io:
- add option to store comments in most readers
- refactor and update read support for BLAST files (outfmt 6, 7 and 10)
- add read support for MMseqs2 files (fmtmode 0 and 4)
- add read support for Infernal tblout files
- stockholm: add support for multiline files
* more minor and major changes ;)

* io.fasta: robust parsing of seq ids from header line, ignore comment lines
* io.stockholm: add row2fts and fts2row functions to parse, write GC and similar lines

* translate: add check_start option

* io: add option to write files automatically into an archive
* io.gff: allow to store comment lines while reading
* scripts: add translate and feature commands

* initial release