Made acquire_sindex_block_for_read and acquire_sindex_block_for_write not declare that they throw an interrupted_exc_t.
Removed interrupted_exc_t throws declaration on add_sindex.
Added an RSI concerned about erase_all behavior.
Removed the long-unused function drop_all_sindexes.
Removed the unused function delete_all_secondary_indexes.
Fixed RSI in the translator.cc.