Enhancements and improvements:

• Mask to insert and edit placeholders added.
• Network folders and standard folder "Pictures" are shown in folder tree.

Following errors are corrected:

• Program crashed during multi-edit, if comment was not filled and "append comment" was selected.
• Program crashed after multiple pressing Ctrl-A in file list.
• Export of properties with several values (e.g. of type LangAlt, XmpSeq) was incomplete.