Extraneous error codes

[chreekat]

#9162 added these error codes:

+  RunProgramInvocationException{} -> 8012
+  GetProgramInvocationException{} -> 7300
+  GetProgramInvocationLBSException{} -> 6578

6578 and 8012 are effectively the same error, simply used in two different functions.

7300 is unused (probably an oversight -- I can see where it would go based on the pattern followed by the first two).

Would it make sense to create a new ProgramInvocationException and use it everywhere a program invocation fails?