SSDM-13300: Change how data_set search command works, added functionality to download command to read data from the input csv file. Fixed documentation.

SSDM-13300: renamed type param in search command. Refactored download command to perform checksum check of files

SSDM-13300: oBIS 0.4.0-rc2. Fixes to get parents/children command. Updated documentation. Changed way to modify global config.json to no longer require git and git-annex

SSDM-13300: Moved obis README to main docs directory, created symlink to obis directory for proper pypi package creation