Bug Workaround - locking

- Added support for the "locking" configuration variable that disables
  file locking.  This can be helpful to folks who use task on Solaris,
  and store their task data files on an NFS mount.

src/Config.cpp

@@ -132,6 +132,7 @@ void Config::createDefault (const std::string& home)
         fprintf (out, "color=on\n");
         fprintf (out, "due=7\n");
         fprintf (out, "nag=You have higher priority tasks.\n");
+        fprintf (out, "locking=on\n");
 
         fprintf (out, "color.overdue=bold_red\n");
         fprintf (out, "color.due=bold_yellow\n");
@@ -222,11 +223,13 @@ bool Config::get (const std::string& key, bool default_value)
   {
     std::string value = lowerCase ((*this)[key]);
 
-    if (value == "t"    ||
-        value == "true" ||
-        value == "1"    ||
-        value == "yes"  ||
-        value == "on")
+    if (value == "t"      ||
+        value == "true"   ||
+        value == "1"      ||
+        value == "yes"    ||
+        value == "on"     ||
+        value == "enable" ||
+        value == "enabled")
       return true;
 
     return false;