Work on bgo#596635 - gcalctool script will need to be updated for 2.29/2.30/3.0
Work on bgo#596635 - gcalctool script will need to be updated for 2.29/2.30/3.0

This fixes the following issues:
1. Orca no longer speaks the results in gcalctool 5.29.
2. Orca doesn't present the text of errors when it appears. This
   is actually true for gcalctool 5.27 and 5.28 as well, but in
   those versions the error text was in a status bar which the
   users could access if it dawned on him/her to check down there.
   Now the errors appear in a text object beneath the results.
   (which is what caused issue #1). This patch handles both the
   old- and new-style presentation.
3. The gcalctool script's onWindowActivated was not calling the
   the default script's as often as I'd expect. Maybe that was
   intentional, but from the testing I've done both in 5.28 and
   5.29, I've not found a reason why.
4. Cruft removal was in order. ("In GNOME 2.6....") :-)

chrys87/orca-beep,pvagner/orca,GNOME/orca,chrys87/orca-beep,GNOME/orca,pvagner/orca,GNOME/orca,pvagner/orca,h4ck3rm1k3/orca-sonar,chrys87/orca-beep,h4ck3rm1k3/orca-sonar,h4ck3rm1k3/orca-sonar,pvagner/orca,chrys87/orca-beep,GNOME/orca