Implement IANY, IALL and IPARITY for unsigned.

gcc/fortran/ChangeLog:

	* check.cc (gfc_check_transf_bit_intrins): Handle unsigned.
	* gfortran.texi: Docment IANY, IALL and IPARITY for unsigned.
	* iresolve.cc (gfc_resolve_iall): Set flag to use integer
	if type is BT_UNSIGNED.
	(gfc_resolve_iany): Likewise.
	(gfc_resolve_iparity): Likewise.
	* simplify.cc (do_bit_and): Adjust asserts for BT_UNSIGNED.
	(do_bit_ior): Likewise.
	(do_bit_xor): Likewise

gcc/testsuite/ChangeLog:

	* gfortran.dg/unsigned_29.f90: New test.