Add filtering to the config changes admin report

Testing: Login using an admin account In site admin, search for auth_instructions Update the auth_instructions field and press Save changes Navigate to Reports > Config changes in site administration Confirm change from step 3. is reported (existing functionality still works) In the report Search form enter " auth_instructions " in the Setting field and press Search button Confirm only changes related to setting updated in step 3. are listed in report Create a second account ( user2 ) and make them a site admin Login with user2 Repeat steps 2 - 7 above In the report Search form enter " XXX " (where XXX is the lastname of the user created in step 8) in the User field and press Search button Confirm only changes make by user2 are listed in report In the report Search form enter part of the text you used in step 3 in the Value field and press Search button Confirm there are only two rows listed in report: One containing your change in step 3 in the New value column One containing user2 's change in step 10 in the Original value column Determine a date between the time your site was installed and now In the report Search form enable the Date from field, select this date and press Search button Confirm only config changes made since that date are listed Disable the Date from field In the report Search form enable the Date to field, select the date from step 15 and press Search button Confirm only config changes made before that date are listed