load_datasets: gracefully handle SearchIndexErrors
completion_stats generator
fix search index exception name
load-datasets: fix for jl file missing trailing newline
make "create-test-template" target
navl validation: properly check for existing names/ids
update tests: creating package with existing id fails properly
load-datasets: show average line processing rate
Makefile: automatically drop-database on create-database
Makefile: new target "reset-database" = reset db from $DB_TEMPLATE, rename create-database->build-database, create-test-template->build-database-template
Merge pull request #130 from wardi/master

load-datasets fixes+stats, validation fixes for duplicate ids, new Makefile targets