sort some items in Hugin Prefs in a different way

[zarl]

Not a real bug but just to make sure that less advanced users are not puzzled.

In Preferences "Programs" the two topics Enblend and Enfuse each show one selection
  [ ] choose alternative program
followed by two input fields: the first for an alternative path and a second for default arguments.

This way of sorting items could be read as if the "default arguments" are only valid for alternative executables.

I propose resorting items like this:

 Default Arguments:
 All arguments set here are defaults for new projects (...) they are set by hugin
-> (last sentence should also end with a full stop)

 [ ] Use alternative (...) program: <path/to/executable> [Choose executable...]

This way it is made clear that "default arguments" are valid for both an alternative program as well as for the built in version.

[tmodes (tmodes)]

I thought about this. But I think the current placement makes more sense:
1.) When disabling the "choose alternative program" only the program text field is disabled. The argument text field remains enabled. This should provide a feedback that the checkbox affects only the first text field.
2.) Normally you give first the program name and then the arguments. Reverse the order would contradict this "normal" order.
3.) When you give first the arguments and then the program name then somebody could also think that the argument does not belong to the given program name below (and he/she would put the arguments for the alternative program in the program text field, where there are wrong.)