Fix bug in process_location_types.R script

[jenniferfedor]

We resample a row of location data forward in time into the next minute bin until 1 ms before the next sensed location timestamp or the timestamp corresponding to last sensed timestamp plus the consecutive threshold buffer is reached, whichever comes first. This can result in time differences <1 minute (60000 ms), and as small as a few ms, between a final resampled row and the subsequent sensed location row:

resample_group	limit	timestamp	provider	id	diff_bw_curr_and_next_row_ms
830	1660842237896	1660842117894	fused	0	60000
830	1660842237896	1660842177894	resampled	1	60000
830	1660842237896	1660842237894	resampled	2	3
831	1660842357892	1660842237897	fused	0	60000
831	1660842357892	1660842297897	resampled	1	59996
832	1660842477893	1660842357893	fused	0	60000
832	1660842477893	1660842417893	resampled	1	60001

The inclusion of such rows in the processed locations data can result in unexpected negative values for features like varspeed (which should always be non-negative) in processed data from the PHONE_LOCATIONS DORYAB provider downstream.

We therefore add a condition to drop rows from the processed locations data when the provider is resampled and the difference between that resampled row's timestamp and the next (leading) timestamp is <60000 ms:

resample_group	limit	timestamp	provider	id	diff_bw_curr_and_next_row_ms
830	1660842237896	1660842117894	fused	0	60000
830	1660842237896	1660842177894	resampled	1	60003
831	1660842357892	1660842237897	fused	0	119996
832	1660842477893	1660842357893	fused	0	60000
832	1660842477893	1660842417893	resampled	1	60001

Note that this change still allows for the time difference between two sensed location timestamps to be <60000 ms. It only ensures that the time difference between a resampled timestamp and subsequent sensed location timestamp will be $\ge$ 60000 ms. The time difference between a sensed location timestamp and subsequent resampled timestamp or between two consecutive resampled timestamps is always exactly 60000 ms.