Find path correctly when run from symlink. (by Adam Porter)

Fixes lp:907278

bin/pithos

@@ -38,11 +38,12 @@ DBusGMainLoop(set_as_default=True)
 
 # Check if we are working in the source tree or from the installed 
 # package and mangle the python path accordingly
-if os.path.dirname(sys.argv[0]) != ".":
-    if sys.argv[0][0] == "/":
-        fullPath = os.path.dirname(sys.argv[0])
+realPath = os.path.realpath(sys.argv[0])  # If this file is run from a symlink, it needs to follow the symlink
+if os.path.dirname(realPath) != ".":
+    if realPath[0] == "/":
+        fullPath = os.path.dirname(realPath)
     else:
-        fullPath = os.getcwd() + "/" + os.path.dirname(sys.argv[0])
+        fullPath = os.getcwd() + "/" + os.path.dirname(realPath)
 else:
     fullPath = os.getcwd()
 sys.path.insert(0, os.path.dirname(fullPath))