* std/std_valarray.h: New file.
 	* std/slice.h: New file.
	* std/slice_array.h: New file.
	* std/gslice.h: New file.
	* std/gslice_array.h: New file.
	* std/mask_array.h: New file.
	* std/indirect_array.h: New file.
	* std/valarray_array.h: New file.
	* std/valarray_array.tcc: New file.
	* std/valarray_meta.h: New file.
	* valarray.cc: New file.
	* valarray: New file
	* Makefile.in (OBJS): add valarray.o
	(HEADERS): add valarray
	(valarray.o): define dependency on valarray.cc
	(install): make it possible to install valarray files.

From-SVN: r27354