Simplify the string comparison done when checking 'textmatch' rules
to decide whether to highlight something.
Fix the menu titles when setting up a textmatch via 'O': the title
for color referred to attribute and the one for attribute used the
default. The two tiles are set up in advance; the one for color was
set correctly but then the one for attribute was written into the
wrong buffer.
When using 'O' to manipulate hilite_status rules, if there are any
when you're done and the 'statushilites' option (iflags.hilite_delta)
is 0, give a message reminding that it needs to be non-zero for
highlighting to be activated.