Improve [:alpha:] and [:alnum:] for multibyte characters (Bug#19878)
src/character.c (alphabeticp, decimalnump): New functions. src/character.h (alphabeticp, decimalnump): Add prototypes. src/regex.c (ISALNUM, ISALPHA): Check Unicode character properties for multibyte characters by calling alphabeticp and decimalnump. (BIT_ALPHA, BIT_ALNUM): New bit masks. (re_wctype_to_bit): Return them when the class is RECC_ALPHA or RECC_ALNUM. (re_match_2_internal): Call ISALPHA and ISALNUM when appropriate. doc/lispref/searching.texi (Char Classes): Update the documentation of [:alpha:] and [:alnum:]. etc/NEWS: Mention the changes in [:alpha:] and [:alnum:].
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