Ticket 300: Add c*r functions to appendix and index

Jussi Piitulainen writes:

These six appear in the listing for the (scheme base) library and in the index of r7rs, apparently because they are named in the text:

caar cadr car cdddar cddddr cdr

These twenty-two are not named in the text and are missing in the library listing and the index:

cdar cddr

caaar caadr cadar caddr cdaar cdadr cddar cdddr

caaaar caaadr caadar caaddr cadaar cadadr caddar cadddr cdaaar cdaadr cdadar cdaddr

Do all these need to remain in the language? In (scheme base)? If so, they should be added to the listing and the index but unobtrusively.