[DONE] Switch to high speed on Canon bracketing

[Marsu42]

I only use Canon bracketing for handheld because it's faster than ml. All the time this involves two steps - setting the bracketing distance and then switching to high speed continuous, and I sometimes forget the latter (doh).

Request: Shooting Preferences -> Fast Canon bracketing (check on half-shutter, then switch).

I could try do this myself, but I don't know how to check if Canon bracketing is set or not (ist it PROP_DEFAULT_BRACKET?) :-o

[a1ex]

Hint: when Canon bracketing is active, ML displays an error. If you start from that message, you will see PROP_AEB.

Now that we have take_fast_pictures, it may be possible to speed up the bracketing sequence too (e.g. if you have a simple 3x1 bracket, just use Canon's version without any prefs menu entry).

[Marsu42]

Hint: when Canon bracketing is active, ML displays an error. If you start from that message, you will see PROP_AEB.

Found it & it works, will upload this feature with the next pull request.