Check Newest files age and size in Diredtory

The script doesn't properly determine which file is the newest one. The IF statement on line 113 is incorrect.

Also the name "check_fileage" is confusing, it's too similar to the natively provided "check_file_age" plugin.

My suggestion is:

1) Rename the script to "check_newestfileage", and so a search/replace inside the plugin to change all instances of "check_fileage" to "check_newestfileage".

2) Remove the "else" clause on the IF statement on Line 111, so change this:

if($diff

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