SAD: no longer maintain file-read management
PY3: fix sniffer hack for py3
Merge pull request #703 from ebolyen/remove_offset_management

SAD: no longer maintain file-read management
Revert "TEMPORARY workaround for I/O seek/tell bug"

This reverts commit e070f39876547b0d83c4047d3a9a9e1b0a0d4dcc.
Merge branch 'master' into issue-678
Deprecate fasta formatters