A missingness query for the gVCF variants using a User-Defined function to observer the reference-matching blocks that overlap each variant.
First draft of data encoding and schema comparison story.
Merge branch 'master' into gvcf-variants
Updated content to point to table holding corrected version of expanded gVCF data.

Updated relevant content and continued to QC the data as part of writing the data story.
Quick write up of provenance details for new tables.
Added links to issues found during checks of the new tables to the data story.

None of the issues are blocking completion of the story though.
Ti/Tv and allelic frequency queries for each of the schemas and data encodings.
Allelic frequency queries for the schema comparison story.
Moved klotho sql to a different directory for use in multiple data stories.

Also added some ORDER BY to the queries in this story missing those - makes it easier to determine true differences in results versus results just coming back in a different order.
Added klotho queries for two other tables.
Allelic frequency queries for the comparison data story.
SQL and script tweaks per completion of the allelic frequency computation for PGP gVCF data.
Tweak to improve the performace of the User-defined function for allelic frequency.

Its better to move any applicable WHERE clauses out of the UDF and into the input specification.
Tweaked additional UDFs to improve performance.
Update the UDF version of the missingness query to be similar to the non-UDF version so that the small change is very clear.
Story and observations of query performance for the different schemas.
Fix for #11.

Also updated the comments and logic for sample id parsing so that the script runs without error when run stand alone (not Hadoop).
Correction to comments for sample_id extraction from file path.
Switch bq tool queries to asynchronous mode.
Added additional comments for UDF queries.

Added limited preview disclaimer and link for more details per feedback from @fhoffa