slow5tools-v0.6.0

Changes are:

• now slow5tools can be built with HDF5 disabled, for those who just want to manipulate BLOW5 files (@lh3 thanks for the suggestion). To do so, call ./configure --disable-hdf5 && make or completely bypass the configure step and just call make disable_hdf5=1.
• usability improvements
• added new faqs and workflows