improve the init configure file;
support empty database and indices:you can remove all triples from a db and insert/query;
change signature struct and generating method in build;
change FIFO to LRU; fix bug in Signature, the int maybe overflow;
test on shape.db, 0.7B triples with 0.42B entities
remove most warnnings;
adjust debug system;
add Stream for ResultSet;
cant add Stream for IDlist and maybe not need;
add redirection for gquery console;
add realpath for soft links but not enable;
author: zengli