some tools that might be handy:
* Merge - two or more .crispr files together
* Split - a .crispr file apart
* Filter - remove/copy groups if they fit/don't fit criteria
+ number of spacers
* Extract - fasta sequences
+ direct repeats
+ spacers
+ flankers
+ concensus sequences
* Draw - a graphviz representation of the crispr
* Sanitise - change all the unique ids to incrementing numbers
* Extract/Add metadata