Update janino, allow default imports for expressions
remove unused const eval interface
Implement hash expression (md5 for now) operator as requested my @billhowe
Histogram query: be more efficient

Equivalent, but much more efficient, algorithm.
Merge branch 'dhalperi-improve-profiler' into slxu-kill-query-at-aborted-downloading
Fix comment
Merge pull request #609 from uwescience/dhalperi-improve-profiler

Histogram query: be more efficient
Merge branch 'master' into hash-expression
reinstate spacing
Merge pull request #608 from uwescience/hash-expression

Hash expression
Merge branch 'master' into slxu-kill-query-at-aborted-downloading