Fixed #566, #568.
Since "package" is actually a file path, it should be able to contain dashes.
Changed the xsd database>package data type to `file` and adapted simple type `file` to allow them to contain dashes.
Added a test for it.
Added `-` to the xsd simple type `file` comment.
Merge pull request #570 from MArcJ/master

Fixed #566, #568. Dashes in xsd database>package.