Update get_checkpoint_detail query to return winning submission only.
Merge pull request #90 from lsentkiewicz/master

checkpoint API update
Merge pull request #91 from Ghost141/master

Update get_checkpoint_detail query to return winning submission only.
change SEQUENCE_MAIN_SEQ to SEQUENCE_COMPONNENT_INQUIRY_SEQ
Merge pull request #92 from wangzhihao/master

change SEQUENCE_MAIN_SEQ to SEQUENCE_COMPONNENT_INQUIRY_SEQ
checkpoint api update