Fix some missing payload fields

Fixes a problem with 0.5.2 and 0.6.0 where some sub-fields of the payload key were missing.

Changed signature of Dataset.summaries

0.6.0

Bug 1322768 - Use Spark to list file summaries

0.5.2

Support GPU process histograms/keyedHistograms in get_pings_properties

0.5.1

Fix documentation typos.

0.4.14

Fix documentation typos.

0.4.13

Improve documentation of HBaseMainSummaryView.

0.4.12

Improve documentation of HBaseMainSummaryView.

0.4.11

Find HBase master using tags.

0.4.9: Add API to access HBase main summary view.

We want to evaluate HBase to access the history of individual clients as filtering
out individual clients from the main_summary dataset is very slow.  At the end of
January we will decide if we want to keep investing into it or not depending on its
usefulness.

0.4.8

Bug 1318703 - Use setuptools_scm to define package version