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Bugfix #25280

Image: sequence option was hardcoded to assume "first frame" was always
picture "001". Made it impossible to have a sequence of images starting
with picture like "000"

Note that by allowing to render a first frame as 000 in Blender, things
mess up a bit here. Things work now as follows:

- Start Frame = 1 : Image 001 on frame 1
- Start Frame = 0 : Image 001 on frame 0
- Start Frame =-1 : Image 000 on frame 0 ;)

This is of course the lack of proper control for image sequences.
Definite something to work on; best idea I have now is a new setting
that defines the Image Number to be "first frame". That way you can
map that number on any Blender frame. Or it makes it more confusing? :)

For the doc department: the proper meaning of "Start Frame" now is:

"The blender frame a sequence starts playing, assuming the sequence
starts with image #1"

Tooltop was fixed accordingly

(Also fixed 'remove doubles' to show more precision in toolbar)

source/blender/blenkernel/intern/image.c

@@ -2221,7 +2221,7 @@ void BKE_image_user_calc_frame(ImageUser *iuser, int cfra, int fieldnr)
 			if(cfra==0) cfra= len;
 		}
 		
-		if(cfra<1) cfra= 1;
+		if(cfra<0) cfra= 0;
 		else if(cfra>len) cfra= len;
 		
 		/* convert current frame to current field */