Improved login error output for ICAT3 and ICAT4. Refs #7639.
Improved exception handling in `ICat4Catalog.cpp`. Refs #7639.
Improved logout error message for ICAT. Refs #7639.
Inform user where download file is being saved to. Refs #7639.
Merge branch 'feature/7639_Add_support_for_ICAT4_interface' into develop