Dori

This release adds per-site modified base ground truth aided basecaller training data set creation. See docs.

This release also fixes a number of bugs:

• Correct base quality scores in mod_mappings.bam output ( #56 )
• --num-reads option functionality restored
• Fixed bug where reads were skipped
• Add threading and multiprocessing to read enumeration and raw signal extraction to recover more robust performance ( #49 )