Change stable version to WPL1.7.3

git-svn-id: https://plugins.svn.wordpress.org/real-estate-listing-realtyna-wpl/trunk@967195 b8457f37-d9ea-0310-8a92-e5e31aec5664
Removed unused files

git-svn-id: https://plugins.svn.wordpress.org/real-estate-listing-realtyna-wpl/trunk@967196 b8457f37-d9ea-0310-8a92-e5e31aec5664