1. Made cortex storage faster and more stable.
2. Made improvements of blockchain synchronizing
#279 #276 #275 #278 #277 #281 #280 #282
MD5 (cortex-centos-1.9.21-bdae203.tar.gz) = 643e4b0c0d0e2c98951447396d882be1
MD5 (cortex-centos-1.9.21-bdae203.zip) = 21db9745fe5d0b73771982ac793c86a8
MD5 (cortex-linux-amd64-1.9.21-bdae203.tar.gz) = 4f8564775633930a85eac13b8a625f52
MD5 (cortex-linux-amd64-1.9.21-bdae203.zip) = ccb27ccea17c554adc65976716ce6e5e