Fast5File: support new FAST5/HDF5 structure (from R9 runs)
Fast5File: support new FAST5/HDF5 structure (from R9 runs)

New-style FAST5/HDF5 files do not have 'InputEvents' link anymore.
Instead, there is a fixed 'Raw/Reads/Read_NNN' item.

Refactor find_read_number_block() into two functions:
  find_read_number_block_link() - read old-style files
  find_read_number_block_fixed_raw() - read new-style files.

Try one, then the other. Bail out with an informative error message on
failure.

arq5x/poretools,arq5x/poretools