Fixed bug in remote file listing method

[aburrell]

This addresses #5 and also improves the style of the general instrument template, which will eventually be fixed up to address #1.

To test:

import datetime as dt
import pysat
import pysatMadrigal as py_mad

dmsp_f13 = pysat.Instrument(inst_module=py_mad.instruments.dmsp_ivm, tag='utd', inst_id='f13')
out = dmsp_f13._list_remote_files_rtn(dmsp_f13.tag, dmsp_f13.inst_id, user="Your Name", password="your@email", start=py_mad.instruments.dmsp_ivm._test_dates[dmsp_f13.inst_id][dmsp_f13.tag], stop=py_mad.instruments.dmsp_ivm._test_dates[dmsp_f13.inst_id][dmsp_f13.tag] + dt.timedelta(days=1))
print(out)

Yields

1997-12-31    dms_ut_19971231_13.002.hdf5
1998-01-01    dms_ut_19980101_13.002.hdf5
1998-01-02    dms_ut_19980102_13.002.hdf5
dtype: object

[jklenzing]

This works locally for me for all but the oblique products from jro_isr.

I have a branch that incorporates this into unit tests, but it requires some quality of life upgrades at pysat. I can push those branches if you want to solve everything now. Or we can finish this one to fix dmsp and write up an issue for jro.

[aburrell]

Second option!