SP-Forth 4.29

The short list of changes of src and lib is in docs/whatsnew.en.txt.

The full list of changes: compare v4.20...v4.29.

Files:

• sp-forth.v4-29.win32.zip — src, lib, docs, and binaries for Windows (i.e., the sources without devel);
• sp-forth-devel.v4-29.zip — devel only (if downloaded separately, it should be placed into the directory sp-forth/);
• Source code (zip) (or tar.gz) — all sources as is, without binaries;