timeSelector: improved functionality

- the improved side-effect of enabling -zeroTimea alters default selection
  behaviour and -latestTime selection behaviour for utilities in which
  accidentally using the 0/ directory can cause damage (eg, reconstructPar)
- can combine -time ranges and -latestTime

applications/utilities/parallelProcessing/reconstructPar/reconstructPar.C

@@ -45,8 +45,10 @@ Description
 
 int main(int argc, char *argv[])
 {
+    // enable -constant ... if someone really wants it
+    // enable -zeroTime to prevent accidentally trashing the initial fields
+    timeSelector::addOptions(true, true);
     argList::noParallel();
-    timeSelector::addOptions();
 #   include "addRegionOption.H"
     argList::validOptions.insert("fields", "\"(list of fields)\"");