* casefiddle.c, casetab.c, category.c: Use bool for boolean.

* casefiddle.c, casetab.c, category.c: Use bool for boolean.

* casefiddle.c (casify_object, casify_region):
* casetab.c (set_case_table):
* category.c, category.h (word_boundary_p):
* category.h (CHAR_HAS_CATEGORY):
Use bool for booleans, instead of int.