plsqldoc: should not try to cross-reference meta data itself

[Niek]

All information that is meta data should not get cross-referenced.

For example if you define an ID field as a view column it should not get cross-referenced at all in the 'Name' column (it will right now if you have a column id defined somewhere).

Also having a column 'Y' defined all Optional value entries will get referenced to that field...

Example (view):

Columns
Name Type Optional Default Comments
ID NUMBER(10) Y