Finish ripping out the old FASTA and FASTQ parsers.
Merge 'spartanem:mt-reader' into 'ged-lab:bleeding-edge'.
Rip out all the ReadMask stuff everywhere.
Fix small memory leak: delete parser states in parser destructor.
Fix huge memory leak: delete parser object created by 'consume_fasta' compatibility wrapper method for hashtables.
sweep out the reads with multiple query files/ht