* fix out-of-bounds read in r_search_strings_update
* Remove static variables searchhits maplist maxhits first_hit in cmd_search.c
* Change semantics of r_search_hit_new (update kw->count s->nhits in it), return 2 if search.maxhits is reached and stop searching immediately
* honor search.maxhits in r_search_regexp_update
* Refactor _cb_hit, remove bckwrds/do_bckwrd_srch and static cmdhit
* Fix mem leak in regexp.c
* Add support for /d (delta) /bd (backward + delta) when crossing blocksize boundaries
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