See extended commit description :)

- Removed the [useless] limit in number of results (it was 500 before)
- You can now list all files for a given platform, as requested
:   ...&req=search&platform=68k   for example.
- Changed all occurences of "title" by "name" which makes more sense, I
believe.
- Rewrote the wtf-esque multiple-fields-to-array things, which
simplified other things.
- "Author", "Category", and "Platform" fields are now always arrays of
string(s)