* archive_tar.cc: Drop commented out static variable definitions.

	* archive_tar.cc: Drop commented out static variable definitions.
	(archive_tar::next_file_name): Replace MAX_PATH with CYG_PATH_MAX.
	* archive_tar.h (tar_state::filename): Ditto.
	* cygpackage.cc (cygpackage::cygpackage): Ditto.
	* cygpackage.h (cygpackage::getfilenamebuffer): Ditto.
	* desktop.cc (start_menu): Add comment.  Drop Windows 9x considerations.
	(desktop_icon): Ditto.
	(check_desktop): Ditto.
	(check_startmenu): Ditto.
	* diskfull.cc (diskfull): Drop Windows 9x considerations.  Convert
	incoming path to wide char and call GetDiskFreeSpaceExW.
	* filemanip.cc (fopen): New function, overriding MSVCRT function.
	Explain why.
	(remove): Ditto.
	(rename): Ditto.
	(_access): Ditto.
	* install.cc (check_for_old_cygwin): Add comment.
	* localdir.cc (browse): Add comment.
	(LocalDirPage::OnNext): Don't rely on being able to change CWD.
	Call GetFileAttributesW instead and change conditional expressions
	accordingly.  Explain why.  Rename trySetCurDir to tryLocalDir to
	avoid confusion.  Call do_from_local_dir rather than do_fromcwd.
	* mount.cc (read_mounts): Add comments.  Call GetSystemWindowsDirectory
	rather than GetWindowsDirectory since that's what we're really want.
	* postinstall.cc (do_postinstall_thread): Drop setting CWD.  Scripts
	are called with CWD set to Cygwin root dir anyway.
	* processlist.cc (Process::getName): Allow CYG_PATH_MAX sized module
	names.
	(Process::isModuleLoadedInProcess): Allow CYG_PATH_MAX sized module
	names.
	* root.cc (browse): Add comment.
	* script.cc (sanitize_PATH): Call GetSystemWindowsDirectory rather than
	GetWindowsDirectory since that's what we're really want.
	(Script::run): Allow cmdline up to CYG_PATH_MAX chars to allow longer
	script paths.
	* win32.h (CYG_PATH_MAX): Define as 4096 as Cygwin's PATH_MAX.