add some methods and attributes to determine percentage search.
Change the code for percentage search.
Add new feature to support attribute in query.
Fixed a bug that after finding a non-dataset document, then go back to find dataset document for it in xml_relation table.
Revise code to make validateion work.
Change the code for validation.
Delete the code that adding access rule for access file itself.
Chage the debug level for display the free connection number.
Add a piece of query to get rid of invalid number in nodedata.
Fixed a bug that if new triple is a new rule in xml_access table, the new triple wouldn't be added into data set file.
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