Refactor search system - Githubissues

Those changes to the substance search system are needed in order to ease API implementation

[ ] autocomplete system stays as is but might need refactor, as it could be probably be shared with aliases API view
[x] substance view routing is made strict and should not handle names or aliases anymore. it should be on-par with what will be used in API substance view routing
[x] GET search view without parameters serves current substance search form
[x] substance search logic is handled in manager, as those functions are complex for now they may need a bit of refactoring
[x] write unit tests for the search logic
[x] GET request with a query parameter populates the form server-side
- if form is valid and manager returns an entry, perform a permanent redirect to this entry page
- if form is not valid or manager cannot find a match, render the form again (current behavior)

x-yzt / mixtures