Version 2.00

- ENH: Implement upwards directory hierarchy search for backup directories, and then re-create the path to the current file inside that parallel backup directory hierarchy.
- ENH: :WriteBackupMakeAdjacentDir now optionally also takes a target directory to better support the new upwards directory hierarchy search.
- Abort :WriteBackupMakeAdjacentDir on error.
- Add dependency to ingo-library (vimscript #4433). *** You need to separately install ingo-library (vimscript #4433) version 1.011 (or higher)! ***