Fix bugged rule #770 CommentRequired

Problems solved on :

1. org.eclipse.jdt.source.all.xmi: "Feature name does not exist on TagElement at getAnnotationTypeDeclarationsFromBodyDeclaration#17(analysis.atl[745:5-745:41])"
2. avoid-enum-as-identifier.xmi : "Unable to access visibility on OclUndefined at matchesCommentRequiredProperty#16(documentation.atl[57:48-57:72])" and "Unable to access name on OclUndefined at avoidStringBufferField#32(bestPractices.atl[84:20-84:38])"

Fixes for :

• (1) : Removed totally unecessary method getAnnotationTypeDeclarationsFromBodyDeclaration() and simplified the way of getting annotations. This avoids going through other unconcerned elements (source of the error).
• (2) : The original avoid-enum-as-identifier.xmi seems to have been incorrectly generated, leaving an incomplete generation of the FieldDeclaration object for "enum" in the model. This caused the following problems :
  • the error message (2) for the helpers commentRequired() and avoidStringBufferField()
  • no error message for the helper AvoidEnumAsIdentifier() but doesn't produce any measure for violation of AvoidEnumAsIdentifier in metrics.xmi.
  • Fix: Regenerated avoid-enum-as-identifier.xmi correctly by setting java version to 1.4 (to allow writting enum as identifier) using the same PMD example as the original input file. This gives no more errors, and produces output Measure AvoidEnumAsIdentifier in metrics.xmi.