Fix and simplify kw/query code

Old code had problems with trailing space--which did not manifest itself
until now when I tried to use infix query (e.g. 'foo%sbar' would always
result in space after '%s').

Turns out that `read` with multiple variables splits the line just as we
need it with no extra leading/trailing junk.

src/ffoo/saturnin_urimagic.sh

@@ -67,11 +67,8 @@ __saturnin_urimagic__deref() {
     local query     # query part,   eg. "hello dolly"   or "1234"
     local pfx0=$saturnin_urimagic__inipfx0
     local pfxN=$saturnin_urimagic__inipfxN
-    while read line;
+    while read kw query;
     do
-        line="$line "
-        kw=${line%% *}
-        query=${line#$kw }
         debug -v kw query
         if test -n "$query";
         then