Dialog for project settings

[GreatYYX]

Need to implement a project setting dialog box, which can be open from project list (or/and open it from the menu of project page).

It should contains:

• image_prefix, string, default to ""
• hide_timelines: bool, default to false
• newline_type: newline or break, default to break
• show_images_in_search_form: bool, default to false
• show_images_in_facets: bool, default to false
• default_desired_num: integer, range in [0, 999999999], default to 0

POST /mydig/projects/<project_name>
 {
    "image_prefix": "",
    "default_desired_num": 0,
    "show_images_in_facets": false,
    "show_images_in_search_form": false,
    "hide_timelines": false,
    "new_linetype": "break"
 }

[GreatYYX]

one more attributes: default_desired_num

[GreatYYX]

updated.