fix deletion of partitioned tables

* when the WHERE clause had no match all partitions were deleted
Merge pull request #1217 from crate/m/delete_partition_fix

fix deletion of partitioned tables
use partition ident in copy from

was ignored before and import was done into `null`
partition.

This fixes https://github.com/crate/crate/issues/1215
fix lt and gt operator
fix update on partitioned tables
added test for partitioned update with not and conjunction
implemented partition visitor

and use it in DataStatementAnalyzer.generateWhereClause(...)
for compatibility reasons. should be moved to DocTableInfo.getRouting(WhereClause)
resolve partitions using normalizer and partitionExpression
fix benchmark runs
move benchmark results dir to build dir