Improve search

[stefanbohacek]

Necessary for the botwiki/open-source-bots#1 merge:

• Search term1 AND term2 AND etc by default, example.
• Implement an OR operator.
• Keep the search term in the search input.

Nice things to have:

• Fuzzy search: this should give the same results as this. This should also work. (Or at least show Did you mean...?). This should be useful.
• If appropriate, instead of page description show a snippet with the search term(s) highlighted.

Also important:

• Code cleanup (see TODO in relevant files)

[stefanbohacek]

Going back to *term1* AND *term2* being the default, maybe if there are no results, we could just return *term1* OR *term2*?

[stefanbohacek]

I just switched the default search type to be OR and you have to specify if you want to only see pages that have all the search terms (AND). This actually gives better results, for example, I think that tiny star field didn't really return anything before.

Of course, the next step is for tiny starfield to work as well.

[stefanbohacek]

I just added Google Custom Search, keeping this issue open while this is being evaluated.