Re: Cello: a library of string algoritms using succinct data structures

[Libman]

Sorry to be the resident annoying guardian of 
[copyfree](http://copyfree.org/standard/rejected)-dom, but [the Apache License 
on this library](https://github.com/unicredit/cello/issues/1) means that it 
**and everything that uses it** would have to be excluded from all 
pure-copyfree projects that involve Nim...