Paul Medvedev

Improve error message for bad fasta input

1

BCALM doesn't crash nicely when the input is an incorrect fasta file. The current error message is: ``` >cat blin.fa adfad > bcalm -in blin.fa -kmer-size 3 BCALM 2, git...

BCALM2 does not always crash elegantly when the input fasta. For example, ``` >cat blin.fa adfad > bcalm -in blin.fa -kmer-size 3 BCALM 2, git commit e9ba83c setting storage type...

In the [description](https://github.com/GATB/bcalm/blob/master/bidirected-graphs-in-bcalm2/bidirected-graphs-in-bcalm2.md) of how bi-directed graphs are implemented in bcalm2, it would be nice to add another example to the "Bi-directed de Bruijn graph section." Currently, the example there...