Align Channels in RunTS

[kujaku11]

This PR addresses #140 when input channels are slightly off from each other, one maybe have a few more samples.

Update RunTS to locate the differences, estimate the earliest start time, the latest end time and reindex each channel onto a common time index. Xarray tools do not seem to work when the time indexes are slightly off from one another when combining into a dataset. It combines any unique time index and places a NaN on any sample that doesn't have that same time index (using align, merge). If you try to resample/reindex/interpolate a combined dataset it gets FUBARed with misplaced NaN's. Therefore, we need to reindex each channel separately before combining into a dataset.

• Add check for common start, if not get earliest start time
• Add check for common end, if not get latest end time
• Add check for common sample rate, can only be one sample rate.
• Add method to create a common time index
• Add method to reindex each channel to align.
• Update input list to use these tools.
• Update tests
• Update documentation

[codecov-commenter]

Codecov Report

Patch coverage: 88.81% and project coverage change: +0.74 🎉

Comparison is base (69a1fa2) 58.76% compared to head (eccfc44) 59.50%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
+ Coverage   58.76%   59.50%   +0.74%     
==========================================
  Files         120      122       +2     
  Lines       12500    12728     +228     
==========================================
+ Hits         7345     7574     +229     
+ Misses       5155     5154       -1     

Impacted Files	Coverage Δ
mth5/io/zen/zen.py	19.70% <0.00%> (-0.13%)	⬇️
setup.py	0.00% <ø> (ø)
tests/timeseries/test_channel_ts.py	99.73% <ø> (ø)
mth5/groups/master_station_run_channel.py	59.23% <16.66%> (+0.05%)	⬆️
mth5/timeseries/scipy_filters.py	55.86% <70.58%> (+0.93%)	⬆️
mth5/timeseries/channel_ts.py	83.77% <84.61%> (+1.71%)	⬆️
mth5/timeseries/run_ts.py	75.24% <89.55%> (+1.54%)	⬆️
mth5/timeseries/ts_helpers.py	93.47% <93.47%> (ø)
tests/timeseries/test_ts_helpers.py	98.70% <98.70%> (ø)
mth5/__init__.py	100.00% <100.00%> (ø)
... and 1 more

... and 2 files with indirect coverage changes

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