Adds params in init.js for selecting source of CSS ("zimfile", "local" or "mobile"). User selection still to be implemented. Default is "zimfile".
Former-commit-id: 311bac831c130592414cbb0df5ddba7eac61f5aa [formerly 903a65084c766f414c13115fd890017ca579814d]
Former-commit-id: 96c6d751437772809e39a4a41785bcc71cd02cbb