Improve the image POST API

[aleene]

What

• I have been experimenting with the current image write api. Several remarks:
  • add username/password as parameters;
  • image load does not replace current image, then front etc has no meaning;
  • allow to upload images in general, not related to front/ingredients/nutrition;

Part of

• API (Tracker) #5523

[stephanegigandet]

Regarding the 2nd point, the current intended behavior of product_image_upload.pl is to select the image for front / ingredient / nutrition only if there isn't an existing image selected. It is kind of a default image, it is expected that it will then be cropped by the user using product_image_crop.pl

For the 3rd point, I haven't tried it, but just putting "other" for the imagefield probably works. (or any other name for that matter, but maybe we can standardize on other)

[stephanegigandet]

Regarding the password, you can pass user_id and password in the post parameters.

[aleene]

So I delete the image first, and then upload/select the image.
I intend to implement a native crop solution.