Check read names on import

[martinghunt]

Import checks that the fwd/rev FASTQ files are valid FASTQ, and have the same number of reads. The read names can mismatch between the fwd/rev files, but still import. Then the remove contam pipeline fails when BWA MEM throws an error ([mem_sam_pe] paired reads have different names...).

Could add in check during import that N^th read name matches.