new options for jail introduced addfailregex/addignoreregex #867

feature request (#867): new options for jail introduced `addfailregex`/`addignoreregex`: extends regex specified in filter (opposite to `failregex`/`ignoreregex` that overwrites it);

BF: failregex declared direct in jail was joined to single line (specifying of multiple expressions was not possible);

no read takes place only once, but would be not bad if even (anyway shared)...
only options will be cumulated twice to a dict.
<blockquote>might be nice to outline the logic for having opts1st and opts above before their definition</blockquote>
Yes, but too complex in frame of this solution. Possible later, because I think we should rewrite all inheritances of `DefinitionInitConfigReader`.