Re-Add an option that allows to leave code space in the NRWW segment.

The AMFORTH_RO_SEG should always point to NRWW_START_ADDR unless some other code
is used that needs to reside there as well. Note that amforth *starts* at the address
specified and may occupy all space until flash-end. The compile time check for flash
overflow is still valid.

Inpsired by a demand from Enoch.

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1472 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
Mention the traverse-wordlist.

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1476 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
Documentation of the new flexible values.

Some code simplifications too.

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1477 fd1c0b69-5d68-47f5-910c-86182ebb6ecd

Conflicts:
	doc/source/TG/recipes/RAM-Efficiency.rst
	examples/value-variations.frt
Add the value recipe to the programming section

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1478 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
Hopefully a better explaination.

git-svn-id: svn://svn.code.sf.net/p/amforth/code/trunk@1479 fd1c0b69-5d68-47f5-910c-86182ebb6ecd
Matthias deems VALUE standard. Why doesn't his new implementation work...