Variable for bots $categories has some ambiguous types:

• Feed Fetcher, Feed Parser, Feed Reader - what's the difference, really?
• Read-it-later Service is used only for 2 items both for 1 thing: https://getpocket.com/pocketparser_ua. At the same time description on this page clearly says crawling, so should this not be Crawler?
• Search tools is used only for 1 item: http://www.shopwiki.com/w/Help:Bot. Again, description clearly states, that this is a crawler, so should this not be Crawler?
• How does Security search bot differ from Security Checker?
• How does Service bot differ from Service Agent?
• And probably the biggest of it all: what's the difference of Search bot from Crawler? I mean, crawling is done by search bots, so this seems to be the same thing.

I am fine with creating PR to harmonize these things a bit, but I think this warrants a proper discussion first.