Limit scraping

[toshski]

This change allows users to only scrape the first page of the scene lists.

Some sites are now requiring over 50 pages to be scraped to check the scene list, some go over 100. With only a couple of exceptions we scrape all sites in most recent order, so if you scrape daily and are up to date with scenes on a site, you really only need the first page of scenes.

This change allows users to specify if they would like to scrape the whole site (the default) or just the first page of scenes. The user can choose to scrape the first page for some sites and the lot for others.

Benefits:

• scraping is significantly faster
• lees likely of running into been locked out (probably more of a future problem)
• cuts unnecessary traffic for sites

If a user wants to refresh some old scenes, they should switch back a full scrape and the change back when done.

In the exceptions where scraping cannot be controlled by most recent first, the scraper ignores the setting.