unictype/category-byname: Recognize long names as well.

unictype/category-byname: Recognize long names as well.

* lib/unictype.in.h (uc_general_category_byname): Allow argument to be
a long name.
* lib/unictype/categ_byname.c: Include <stdlib.h>, <string.h>,
unictype/categ_byname.h.
(UC_CATEGORY_INDEX_*): New enumeration values.
(uc_general_category_byname): Use uc_general_category_lookup and
convert from index to value.
* lib/unictype/categ_byname.gperf: New file.
* modules/unictype/category-byname (Files): Add
lib/unictype/categ_byname.gperf.
(Depends-on): Add gperf.
(Makefile.am): Add rule for generating unictype/categ_byname.h.
* tests/unictype/test-categ_byname.c (main): Test the recognition of
long names.