Dissolved Inorganic Carbon (DIC), Total Alkalinity, Oxygen and other Hydrographic and Chemical Data Obtained During the SOCCOM float deployment expedition onboard R/V Investigator cruise IN2016_V03 along the GO-SHIP section P15S (EXPOCODE 096U20160426) from 2016-04-26 to 2016-06-30 (NCEI Accession 0168141)