[PLT-363] Updated javadoc
[PLT-363] Deprecated DebtSeniority
[PLT-363] Updated seniority type to SeniorityLevel in non-legacy CDS types
[PLT-363] Removed duplicate members to use only Markit standards and "None".
[PLT-363] Fixed line length
Merge pull request #114 from OpenGamma/topic/PLT-363

Normalized RestructuringClause and SeniorityLevel types.