GitLab

> Summary:
>   Merged changes from branch tree
>   Reversed previous change
> Detail:
>
> * Merged a few changes/fixes from the Unicode library in
>  branch's tree.
>
> * Reversed Steve's change from version 0.50. The change wasn't
>  necessary, and with the changed definition of NOT_USED in this
>  version, it compiles fine with cc 5.45.
>
> * Small comment change in unix.c. It now states that the file
>  isn't equivalent to any in the branch tree.
>
> Admin:
>   Built and briefly tested using TextConv utility on Risc PC.

Version 0.52. Tagged as 'Unicode-0_52'