* keyedit.c (keyedit_menu): Invisible alias "passwd" as "password".
* passphrase.c: Don't check for __CYGWIN__, so it is treated as a
unix-like system.
* options.h, g10.c (main), textfilter.c (standard): Use new option
--rfc2440-text to determine whether to filter "<space>\t\r\n" or just
"\r\n" before canonicalizing text line endings.  Default to
"<space>\t\r\n".