Release v0.4.6
[#114] Added test to check persistence in local DBs after add_atom()
[#39] Add reindex() to rebuild pattern index in local DAS
[HOTFIX] Add empty implementation of reindex()
[#121] Change das.query() return to QueryAnswerIterator
[#122] Add integration test to DAS API used by MeTTa
[BUGFIX] Add delete_atom method in DatabaseMock class
[#134] Update package version
[#138] Implement iterators to incoming_links
[#139] Update TraveseEngine to use IncomingLinksIterators
[#145] Refactor TraverseNeighborsIterator