Changing read syntax for character literals, because we are going to

need the single quote in the Lisp way for suppressing evaluation,
eventually.

I'm going with a Scheme-compatible syntax for character literals.
It has a richer repertoire of standard character names than Common
Lisp, and has a x convention for coding characters in hex.

* lib.c (obj_print): Print characters in a Scheme-like way.

* parser.h (end_of_char): New function declared.

* parser.l (grammar): Implement rules for #\ syntax, with
involving new HASH_BACKSLASH token.
(end_of_regex): Enhancement: added check that end_of_regex is
called in correct state, like the one in end_of_char.
(end_of_char): New function.

* parser.y (repeat_rep_helper, o_elems_transform, define_transform,
lit_char_helper): Functions changed to static.
(rl): Function moved down, past the grammar section.
(HASH_BACKSLASH): New terminal symbol.
(chrlit): Grammar redesigned.
(char_from_name): New function.

* txr.1: Character syntax documented.

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