plot_muts x-axis optionally show years

[averagehat]

I think we originally had it showing years but needed more granularity, but we want to allow both options.

[averagehat]

diff from 1.3.2, plot_muts.py

3c3
<     plot_muts.py --query <query> --refs <refs> [--out <outfile>] [--html] [--cluster] [--years]
---
>     plot_muts.py --query <query> --refs <refs> [--out <outfile>] [--html] [--cluster]
11d10
<     --years              show years instead of days
67c66
< def process(refs_fn, query_fn, save_path=None, html=True, years=False):
---
> def process(refs_fn, query_fn, save_path=None, html=True):
79c78
<     do_plot(ref_dists, ref_muts, ref_names, query_dists, query_muts, query_names, save_path, html, years)
---
>     do_plot(ref_dists, ref_muts, ref_names, query_dists, query_muts, query_names, save_path, html)
82c81
< def do_plot(x1, y1, ref_names, x2, y2, query_names, save_path=None, html=True, years=False,\
---
> def do_plot(x1, y1, ref_names, x2, y2, query_names, save_path=None, html=True, \
96,99d94
<     if years:
<         to_years = lambda y: y / 365
<         x1 = map(to_years, x1)
<         x2 = map(to_years, x2)
233,234c228
<          schema.Optional('--cluster') : lambda x: True,
<          schema.Optional('--years') : lambda x: True
---
>          schema.Optional('--cluster') : lambda x: True
236c230
<         # lambda x: os.access(os.path.dirname(x), os.W_OK))
---
>         #                                      lambda x: os.access(os.path.dirname(x), os.W_OK))
244c238
<         process(refs, queries, out, args['--html'], args['--years'])
---
>         process(refs, queries, out, args['--html'])