Catalogs should use relative paths instead of absolute paths

Hi,

Catalogs should use relative paths for captured pictures like sessions are using.

If you have external drive with plenty of sessions (each session = separate folder under root of the drive; does not matter if USB drive or any NAS) and want to easily filter and search for specific keywords, it would be really great to combine sessions into catalog within the mount point and be able to search and filter for pictures.

Thanks.