Fixed some bug items from the TO-DO list.

Fixed some bug items from the TO-DO list.

* Bring the online help in sync with our commands changes

* Find out why the online help contains the escape sequences like ~@~T (Eric?)

The first was due to bugs in some macro definitions in sst.c, now fixed.
The second was from escape sequences generated into sst.doc by xmlto
for left-and right-quotes, dashes, and no-break spaces; that is fixed
by an additional translation step in makehelp.py.

xmlto still generates line-drawing characters for the tables in the
LRSCAN and REPORT help items, but those look OK on an xterm in text
mode and their help items are suppressed (along with their commands) in
curses mode.

This is not a completely satisfactory solution, but it will do until a
design change makes those help items visible again.