change redisplay to handle some cases where the line consumes more than the number of physical screen lines; add regerror() error messages if regular expression compilation fails; make sure active region readline variables are displayed with bind -v; partial fix for bind -x and commands containing quoting characters

builtins/printf.def

@@ -1493,7 +1493,7 @@ getwidestr (size_t *lenp)
   mbs = garglist->word->word;
   slen = strlen (mbs);
   ws = (wchar_t *)xmalloc ((slen + 1) * sizeof (wchar_t));
-  mblength = mbsrtowcs (ws, &mbs, slen, &state);
+  mblength = mbsrtowcs (ws, &mbs, slen + 1, &state);
   if (lenp)
     *lenp = mblength;
 

builtins/set.def

@@ -141,6 +141,10 @@ Options:
   -   Assign any remaining arguments to the positional parameters.
       The -x and -v options are turned off.
 
+If -o is supplied with no option-name, set prints the current shell
+option settings. If +o is supplied with no option-name, set prints a
+series of set commands to recreate the current option settings.
+
 Using + rather than - causes these flags to be turned off.  The
 flags can also be used upon invocation of the shell.  The current
 set of flags may be found in $-.  The remaining n ARGs are positional