Fix recording of running operator stats

They were not being merged properly into the operator summaries for the pipeline
Add live visualization for query execution

This can be accessed via the "execution" link in the query details UI
Update 0.80 release notes
Update 0.80 release notes
Update to airlift 0.96
[maven-release-plugin] prepare release 0.80
[maven-release-plugin] prepare for next development iteration
Create Hive splits with effective predicate
Pass OrcPredicate stats indexed by column ordinal
Disable ORC String and Date statistics which are broken

The merge logic ORC String and Date statistics are broken so the statistics
for stripes and files in ORC can not be used for String and Date columns.
Add test for OrcPredicate filtering
Rewrite ColumnProjectionUtils.appendReadColumns

appendReadColumns uses previous state in configuration but configuration is used in multiple threads
New method setReadColumns replaces the value completely
Disable new RcFilePageSource code
Add 0.81 release notes
Remove unused field from CompilerConfig
Rename INTERNAL to INTERNAL_ERROR
Add error code for compiler errors
Fix nth_value function
Use equals instead of == for Doubles in LiteralInterpreter
Disable DWRF String and Date statistics which are broken

The merge logic DWRF String and Date statistics are broken so the statistics
for stripes and files in DWRF can not be used for String and Date columns.