civicrm_option_value does not allow much room for storing custom search path

Custom searches are stored in civicrm_option_value, with the file's path/filename in the name column.

I'm pretty certain the intended use is so that custom search files can be stored outside the CiviCRM tree, but there is a restriction of 64 characters on the file path and name. It's not hard to hit 64 chars in a file path.

Not critical - easy to work around with moving files, symlinks or a table alteration - but may confuse some folks if they don't notice the truncated path.