Adding new field to ontologyuri table.
update fill_term_category_v2 function to exclude label and synonyms from equivalent classes. Enhance term_category views to include synonyms etc.
added support for graph_nodes_raw table.
1. bug fix. Removed duplicates in the top_categories table. 
2. add support of the graph_edges_raw table.
1. bug fix. Removed duplicates in the top_categories table. 
2. add support of the graph_edges_raw table.
Fixed possible resource leak in connection pool.
Added a cache for generateExtId function to improve performance.
Added new flag includeDerived in search.
Add shortcut function to improve performance when level = 1 in neighborhood search.
Added more properties to the class to avoid getting them on the fly.
add IRI to the ontology.