[FEATURE] Purge ignored messages from index

[David Bremner]

Markus Weimar <markus.weimar at gmail.com> writes:

> Indexed but subsequently ignored messages remain indexed. I suggest to  purge them from the index as if the files were removed.
>
> Example:
>
> * Create index including spam directory
> * Add spam directory to ignore list
> * Neither ´new´ nor ´reindex 'folder:spam'´ purges the spam messages from the index
>

My first instinct would be to leave new as is, but change reindex to pay
attention to some ignore parameter.

d