Progress: major redesigns with file and directory handling, this changeset is incomplete

Progress: major redesigns with file and directory handling, this changeset is incomplete

In the process of writing the directory copy, I realized I needed to improve the file and directory management.
This triggered me to rethink how I was handling files and directories to some extend.

If memory serves me correctly, the POSIX 2008 was either too new or non-existent when I first wrote some of this.
Updating to use the newer POSIX functionality and changes seems worth this major change.

Add additional file functionality.
Lots of re-organization and redesign.

I still haven't finished this and would rather commit now, with incomplete code randomly throughout, than risk losing any changes.
In particular, the fl_utf_file is where I need to resume.
I need to then update all of the level 3 programs to use the new file/directory handling code.
After that I need to finish writing the directory copy, which should include investigating and implementing file copy operations for more than regular files and symbolic links.
I also need to remember to investigate copying hard links as a hard link instead of as a duplicate file.