* Add some constraint at database level
Fixes#79 and should fix#201 and #113 as well
* Fix tests
Delete duplicated data before adding constraints (only with Postgres, there is no way to do it with Sqlite with complex constraints like the one we are using)
Remove the constraint on media path
* We don't need to drop the media unique constraint anymore
Because we deleted it
* Add search engine to the model
Add a Tantivy based search engine to the model
Implement most required functions for it
* Implement indexing and plm subcommands
Implement indexation on insert, update and delete
Modify func args to get the indexer where required
Add subcommand to initialize, refill and unlock search db
* Move to a new threadpool engine allowing scheduling
* Autocommit search index every half an hour
* Implement front part of search
Add default fields for search
Add new routes and templates for search and result
Implement FromFormValue for Page to reuse it on search result pagination
Add optional query parameters to paginate template's macro
Update to newer rocket_csrf, don't get csrf token on GET forms
* Handle process termination to release lock
Handle process termination
Add tests to search
* Add proper support for advanced search
Add an advanced search form to /search, in template and route
Modify Tantivy schema, add new tokenizer for some properties
Create new String query parser
Create Tantivy query AST from our own
* Split search.rs, add comment and tests
Split search.rs into multiple submodules
Add comments and tests for Query
Make user@domain be treated as one could assume
