esvee v1.0-rc.4

Functional:

• Prep write more detail on discordant stats and write max remote group frags for discordant-only junctions
• Assembly adjusts min fragment rates to load junctions: +1 for split junctions, +3 or discordant-only junctions per discordant rate percentage

Technical:

• optionally specify 'esvee_prep_dir' for inputs for assembly and caller
• removed config 'fragment_length_file' config