Global plants filtering in url

[spalk]

The existing ulr-scheme is bad and should be remake.

Current url scheme looks like:
plants/is_plant/tag/<int:tag_id> or plants/is_seed/genus/<str:genus>
It works and it readable just in case of one or two parameters, but there are many other attributes for filtering.

Should be classic scheme with get-attributes:
plants/?is_plant=1&tag_id=32&genus=lithops&... and so on.