Fixes for issue 141: twelve affected files

Correct the Perl shabang path to '/usr/bin/perl' for the following files:

* bin/test_x10
* bin/xAP-festival.pl
* web/bin/dbmedit.cgi
* bin/test_cgi_error.pl
* web/bin/weather_graph_zoom.pl 
* web/newclock/alarm.p
* web/newclock/index.pl
* web/organizer/calendar.pl
* web/organizer/contacts.pl
* web/organizer/tasks.pl
* web/organizer/tasks.pl
* bin/display_callers