Add validation rule for escape char in IU'sID
Add warning on deprecated version keywords
Change label of some validation rules
Also put warning on id that starts with a ^ and do have dots
Add quickfix for esapce char and deprecated version keyword
Add validation rules against duplicated options and associated tests
Add validation rule for duplicate IU declaration
Added container opposite references on elements
Use the new container reference everywhere possible
Support relative uri with relative path as parameters (fix issue #21)
Improve error handling and progress reporting.