merge lijing's code, support a good sparql endpoint;
bug in download file, and unable to visit by inputing URLs in browser directly;
by lijing and zengli
if load a db and quit on accidents, you can start the gconsole in native mode on the db server,
and use restore command to recover to teh latest db (backup function will be auto started when you connect to gserver and load
a db)
in addition, gserver stablity is improved to deal with query fails
by wanglibo, no modifications to others
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
bookug
bookug