* app.c (do_scrub_chars): In MRI mode, silently end quoted strings

	* app.c (do_scrub_chars): In MRI mode, silently end quoted strings
	at newline characters.  In MRI mode, always keep spaces in the
	operands field.  In MRI mode, treat a line comment character as a
	regular comment character following a space.
	* cond.c (ignore_input): Use strncasecmp rather than strncmp when
	looking for special pseudo-ops.
	* read.c (cons_worker): In MRI mode, the expressions stop at the
	first unquoted space.
	(equals): Likewise.