[Zope] [ANN] Small fix for ZShell 1.4

[Jerome Alet]

Hi,

ZShell 1.41 is now available with a small bug fix wrt history handling :
an empty history (.zshell_history DTML Document) caused ZShell to break.

This problem was mitigated by the fact that when creating a
.zshell_history DTML Document, the default DTML Document content was
there and ZShell knew how to empty it correctly. However you can now clear
(history --clear) the history with no problem.

A small modification was also made to reduce the number of bytes output by
ZShell (usually almost 1/3), and documentation about setenv and unsetenv
was clarified.

To learn more about ZShell, try it online, or download it, please visit :

	http://www.librelogiciel.com/software/

NB : for the hundredths (Yes!) of persons who have tried the restricted
ZShell online : the man command can display more than one manpage at a
time, and with no argument all manpages are displayed (use man man :-) 
 
any comment appreciated.

Jerome Alet