Implement N4100 File System TS

Implement N4100 File System TS

	* acinclude.m4 (GLIBCXX_ENABLE_FILESYSTEM_TS): Define.
	(GLIBCXX_CHECK_FILESYSTEM_DEPS): Define.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: Enable filesystem TS and check its dependencies.
	* include/Makefile.am: Add new headers.
	* include/Makefile.in: Regenerate.
	* include/bits/locale_conv.h (__do_str_code_cvt, __str_codecvt_in,
	__str_codecvt_out): Move code conversion logic from wstring_convert
	into new global functions.
	(wstring_convert::to_bytes, wstring_convert::from_bytes): Use new
	functions.
	(wstring_convert::_M_conv): Remove.
	* include/bits/quoted_string.h (_Quoted_string): Split out of iomanip.
	* include/experimental/filesystem: New.
	* include/experimental/fs_dir.h: New.
	* include/experimental/fs_fwd.h: New.
	* include/experimental/fs_ops.h: New.
	* include/experimental/fs_path.h: New.
	* include/std/iomanip (_Quoted_string): Move to bits/quoted_string.h.
	* python/libstdcxx/v6/printers.py (StdExpPathPrinter): Add.
	* src/Makefile.am (SUBDIRS): Add filesystem.
	* src/Makefile.in: Regenerate.
	* src/filesystem/Makefile.am: New.
	* src/filesystem/Makefile.in: New.
	* src/filesystem/dir.cc: New.
	* src/filesystem/ops.cc: New.
	* src/filesystem/path.cc: New.
	* testsuite/experimental/filesystem/operations/absolute.cc: New.
	* testsuite/experimental/filesystem/operations/copy.cc: New.
	* testsuite/experimental/filesystem/operations/current_path.cc: New.
	* testsuite/experimental/filesystem/path/append/path.cc: New.
	* testsuite/experimental/filesystem/path/assign/assign.cc: New.
	* testsuite/experimental/filesystem/path/assign/copy.cc: New.
	* testsuite/experimental/filesystem/path/compare/compare.cc: New.
	* testsuite/experimental/filesystem/path/compare/path.cc: New.
	* testsuite/experimental/filesystem/path/compare/strings.cc: New.
	* testsuite/experimental/filesystem/path/concat/path.cc: New.
	* testsuite/experimental/filesystem/path/concat/strings.cc: New.
	* testsuite/experimental/filesystem/path/construct/copy.cc: New.
	* testsuite/experimental/filesystem/path/construct/default.cc: New.
	* testsuite/experimental/filesystem/path/construct/locale.cc: New.
	* testsuite/experimental/filesystem/path/construct/range.cc: New.
	* testsuite/experimental/filesystem/path/decompose/extension.cc: New.
	* testsuite/experimental/filesystem/path/decompose/filename.cc: New.
	* testsuite/experimental/filesystem/path/decompose/parent_path.cc:
	New.
	* testsuite/experimental/filesystem/path/decompose/relative_path.cc:
	New.
	* testsuite/experimental/filesystem/path/decompose/root_directory.cc:
	New.
	* testsuite/experimental/filesystem/path/decompose/root_name.cc:
	New.
	* testsuite/experimental/filesystem/path/decompose/root_path.cc:
	New.
	* testsuite/experimental/filesystem/path/decompose/stem.cc: New.
	* testsuite/experimental/filesystem/path/generic/generic_string.cc:
	New.
	* testsuite/experimental/filesystem/path/itr/traversal.cc: New.
	* testsuite/experimental/filesystem/path/modifiers/clear.cc: New.
	* testsuite/experimental/filesystem/path/modifiers/make_preferred.cc:
	New.
	* testsuite/experimental/filesystem/path/modifiers/remove_filename.cc:
	New.
	* testsuite/experimental/filesystem/path/modifiers/replace_extension.cc:
	New.
	* testsuite/experimental/filesystem/path/modifiers/replace_filename.cc:
	New.
	* testsuite/experimental/filesystem/path/modifiers/swap.cc: New.
	* testsuite/experimental/filesystem/path/nonmember/hash_value.cc: New.
	* testsuite/experimental/filesystem/path/query/empty.cc: New.
	* testsuite/experimental/filesystem/path/query/has_extension.cc: New.
	* testsuite/experimental/filesystem/path/query/has_filename.cc: New.
	* testsuite/experimental/filesystem/path/query/has_parent_path.cc:
	New.
	* testsuite/experimental/filesystem/path/query/has_relative_path.cc:
	New.
	* testsuite/experimental/filesystem/path/query/has_root_directory.cc:
	New.
	* testsuite/experimental/filesystem/path/query/has_root_name.cc:
	New.
	* testsuite/experimental/filesystem/path/query/has_root_path.cc:
	New.
	* testsuite/experimental/filesystem/path/query/has_stem.cc: New.
	* testsuite/experimental/filesystem/path/query/is_relative.cc: New.
	* testsuite/util/testsuite_fs.h: New.

From-SVN: r222654