Merge branch 'python3-wxpython4'

After nested function cleanup.

Start of cleanup of nested functions.

Cleanup: Update notes for experimental directory to point to the corr…

…ect protocols directory.

Cleanup: removing unused variables.

Updated changelog.

Updated changelog.

Updated changelog.

Latest copy of manual.

BUGFIX: Windows version had a compilation problem.

The use of 'strndup' in scanner.l caused problems for non-gnu modes of gcc, which
was being invoked for the mingw32 compilation. Replaced now by the more portable
strncpy + malloc version.