Lock files - prevent full path disclosure. Fixes #3580.

@coenjacobs .14
Croatia is EU Fixes #3615.

@coenjacobs .14
Fix result count display when posts_per_page is set to -1

When your posts_per_page is set to -1 the display is output as `Showing 1–-1 of 15 results` when displaying all items when it would be better to show `Showing all 15 results`