* gdb.texinfo (Command Files): Move the description of the startup

	* gdb.texinfo (Command Files): Move the description of the startup
	from here...
	(Startup): ...to this new subsection of the Invocation chapter.
	Rearrange the description of init files more logically and add a
	cross-reference to "Command Files".  Document the special gdbinit
	name for CISCO 68k.  Expand the description of what GDB does
	during startup.
	(History): Add index entry for HISTSIZE.