* libm/libm.texinfo: Rename node Index to Document Index.
	* libc/libc.texinfo: Rename node Library Index to Document Index.
	* faq-setup.xml: Throughout remove setup.exe, use setup or setup-x86...
	instead.
	(faq.setup.cli): Reproduce latest --help output.
	(faq.setup.noroot): New section.
	(faq.setup.setup-fails-on-ts): Remove section.
	* setup-net.xml (internet-setup): Mention setup-x86{_64} in first
	paragraph.  Add note to allow using setup.exe in subsequent paragraphs.
	Add paragraph to introduce --no-admin option.
	* libc/libc/stdlib/getopt.c (getopt_internal): Fix NULL pointer access.
	* faq-setup.xml (faq.setup.uninstall-service): Describe how to unhook
	cyglsa DLL from OS before uninstalling.
	* newlib/libc/include/getopt.h (struct option): name field should be
	"const char *".
	* newlib/libc/stdlib/getopt.c (getopt_internal): Use fputs()/fputc()
	instead of fprintf() to save code space.  Fix signed/unsigned
	comparison.
	* newlib/libc/stdlib/getopt.c (getopt_internal): Add missing braces.
Merge branch 'Cygwin' into develop