Fixes the following issues:
Issue #1857656 by rooby, yang_yi_cn, larowlan: Unknown column 'n.type' in 'where clause' when viewing admin/content/files
Issue #1762904 by laken, bkosborne, miiimooo: Fails to respect core 'view own unpublished content' permission
Issue #1957278: Added disclaimer about hoom_node_grants() to the readme.
Issue #1694874 by mesr01: Error when no content type is created (undefined variable on line 109)
Issue #1192074 by mesr01, Matt V., DuaelFr, et. al.: Respect View_Unpublished permissions on the Content overview page