Lexing and parsing improvements, leaving things less hacky than before,

albeit hacky.

* parser.l (BSYM, NSYM): Regex definitions gone.
(BT0, BT1, BT2, NT0, NT1, NT2): New regex definitions.
(BTREG, BTKEY, NTREG, NTKEY): Rewritten, so that they cannot
match a lone @ character as a symbol name.
(grammar): Rules for returning METAPAR, METABKT and METAQUO
are gone. Instead, we just recognize a @ in the NESTED
and BRACED states and return it as a token.

* parser.y (METAPAR, METABKT, METAQUO): Token types removed.
(meta_expr): Nonterminal symbol removed.
('@'): New token type.
(list): Quotes and splices handling removed from this rule.
The new token '@' is handled here, on the other hand, because
there are places that reference the list rule that need to support
@ expressions.
(n_expr): Reference to meta_expr removed. Quote, unquote and splice
added here.
(yybadtoken): Removed references to METAPAR, METABKT and METAQUO.

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