Minor cleanup and crank up warnings.

test/testit

@@ -30,7 +30,7 @@ if [ -z "$CXX_LANG" ]
 then
     CXX_LANG=c++14
 fi
-OPTIONS="-std=${CXX_LANG} $OPTIONS -I$ROOT"
+OPTIONS="-std=${CXX_LANG} $OPTIONS -I$ROOT -Wall"
 
 case $TRIPLE in
   *-*-mingw* | *-*-cygwin* | *-*-win*)

tz.cpp

@@ -1471,9 +1471,6 @@ find_rule_for_zone(const std::pair<const Rule*, const Rule*>& eqr,
         case tz::local:
             found = tp_loc < r->mdt().to_time_point(ry);
             break;
-        default:
-            found = false;
-            assert(false);
         }
         if (found)
             break;