fix yesterday's update : submit JobTracker.forget to the semaphore

group the job tracking's transactional stuff in one class

All goes in JobTracker, which groups a queue and a set, and keeps the
old mechanism of using a semaphore to make it pausable.

strings get smarter

- can contain a double-quote, escaping it with ~
- can be read from a file : file "cookie.txt"

Introducing "save as base names"

let css processing worker recognize import url() without quotes

css @import targets are explored as well

accept resources with a query-string

Such as ...stuff.css?654321968749684
(seen with Redmine)

remove getDescription from IMatcher

shorter log lines ; better start page forced inclusion ; 0.8

fix unexpected antislash on Windows