New quasiquote idea: let's have two quasiquote macros sharing one

expander. One macro based on sys:qquote, sys:unquote and sys:splice,
and the other based on qquote, unquote and splice in the user package.
The read syntax puts out the sys: one.

* eval.c (expand_qquote): Takes three additional arguments: the
qquote, unquote and splice symbols to recognize.
The invalid splice diagnostic is adjusted based on which backquote
we are expanding.
(me_qquote): Look at the symbol in the first position of the form
and then expand either the internal quasiquote macro or the public one,
passing the right symbols into expand_qquote.
(eval_init): Register error-throwing stub functions
for the sys_qquote_s, sys_unquote_s and sys_splice_s symbols.
Register a macro for sys_qquote_s.

* lib.c (sys_qquote_s, sys_unquote_s, sys_splice_s): New symbol
variables.
(obj_init): Initialize new variables. Change qquote_s,
unquote_s and splice_s to user package.
(obj_print, obj_pprint): Convert only sys_qquote_s,
sys_unquote_s and sys_splice_s to the read syntax.
The quote_s, unquote_s and splice_s symbols are not
treated specially.

* lib.h (sys_qquote_s, sys_unquote_s, sys_splice_s): Declared.

* parser.y (n_expr): Use sys_qquote_s, sys_unquote_s and
sys_splice_s rather than qquote_s, unquote_s and splice_s.
(unquotes_occur): Likewise.

* txr.1: Documented.

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