Version 0.5.0 - Parallel processing

New features:

• support processing multiple location in parallel (--n-cores)
• support other input than tally of SVN mutation, e.g., use tables
  produced by COJAC.
• option to specify a column to use as 'names' for the entries in tally table.
  By default, if 'pos' and 'base' exist a column 'mutations' will be created
  and used as name.
  Bootstraping needs such names for the entries.

Results altering change:

• The random seed initialisation has changed since 0.4.x
  Results between this version v0.5.0 and v0.4.x aren't bit-perfect
  Seed is re-initialised per locataion so parallel and sequencial runs
  are identical.
  Each location gets a different seed.