Add tracking blacklisting

[Arne Bachmann]

e.g. via sos add "-file?.jp*"

[Arne Bachmann]

That's ambiguous because - could be a legit part of the filename, but something like sos addnot <pattern> could work.
Whitelisting would be relevant in simple mode, but also in tracking/picky modes to exclude more specific patterns from more general tracking patterns.

[Arne Bachmann]

Could also add a non-global ignore capability, even for simple mode - but not in the first shot