o Remove some unnecessary backslashes

o collapse multiple !'s by using !+ and checking if yyleng is even or odd.
  this allows us to simplify ! handling in parse.yacc

parse.lex

@@ -139,12 +139,13 @@ WORD			[[:alnum:]_-]+
 			    sawspace = FALSE;
 			  }			/* a command line arg */
 
-\,			{
+,			{
 			    LEXTRACE(", ");
 			    return(',');
 			}			/* return ',' */
 
-\!			{
+!+			{
+			    if (yyleng % 2 == 1)
 				return('!');	/* return '!' */
 			}
 
@@ -244,10 +245,11 @@ PASSWD[[:blank:]]*:	{
 			    if (strcmp(yytext, "ALL") == 0) {
 				LEXTRACE("ALL ");
 				return(ALL);
-			    }
+			    } else {
 				LEXTRACE("ALIAS ");
 				return(ALIAS);
 			    }
+			}
 
 [[:alnum:]][[:alnum:]_-]*	{
 			    fill(yytext, yyleng);