Timestamp related issue

• The Android phone location plugin (same location given at greater than sampling rate, only a few milisecs difference)

Duplication of data 

• TODO
• This should be restricted to the early pilot data,  Presence of duplicates. Apart from their timestamps, two consecutive records of android_phone_relative_location can be identical. The problem is that the timestamps differ less than by 1 second that is considerably lower than the sampling period for that feature.