Review setId() Javadocs for readers/writers

- expand description of setId() for the FormatReader/FormatWriter interfaces
- properly link to the interface setId Javadoc for classes overriding setId()
Merge pull request #1484 from sbesson/javadocs_setid

Review setId() Javadocs for readers/writers
Update copyright headers

Repository: openmicroscopy/bioformats
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