Merge branch '2396_find_whole_words'

Merge branch '2396_find_whole_words'

* 2396_find_whole_words:
  Some optimization of loops in translation functions.
  Create strings with small preallocated sizes.
  mc_search__cond_struct_new_regex_ci_str(): get rid of extra string duplication.
  Minor optimization of translation function arguments.
  Avoid extra-allocation of string while prepare to regexp-search.
  Removed mc_search_cond_t->len (used mc_search_cond_t->str->len instead).
  Fixed bit operations in mc_search_regex__process_append_str()
  Code cleanup for avoid compiler warnings
  Ticket #2396 (Find File "Whole words" search bug)