slow5tools-v0.2.0

Major changes from previous version includes:

• all attributes in fast5 tracking_id and contex_tags groups are now stored in the header despite they are empty
• better multi-threading of merge programme and temporary directory is no longer needed (note: --tmp-prefix is deprecated now, -K option added)
• view programme is multi-threaded (-t and -K options)
• -o in split programme is now -d to retain consistency
• get programme is improved (header printed now, better multi-threading)
• improved usability (e.g., usage messages, better warnings, better support for vbz compressed fast5 files, etc.)
• various bug fixes