v0.61

Added support for Metrichor changes to FAST5 output format.
Added support for multiple analyses in 1 file (i.e. /Analyses/Basecall_2D_XXX). New option -basecallindex to support it, but default behaviour is latest (highest numbered analysis).
Replaced the NANOOK_SCRIPT_DIR environment variable with a NANOOK_DIR one and slightly changed installation process.