** In Text mode, now only blank lines separate paragraphs.
This makes it possible to get the full benefit of Adaptive Fill mode
in Text mode, and other modes derived from it (such as Mail mode).
TAB in Text mode now runs the command indent-relative; this
makes a practical difference only when you use indented paragraphs.
As a result, the old Indented Text mode is now identical to Text mode, and is an alias for it.
If you want spaces at the beginning of a line to start a paragraph, use the new mode, Paragraph Indent Text mode.