Fix for the following items about escape sequence

   by Marcelo Aceto <aceto@newinf.com.br> .

1) Wrong translations of embedded escape sequences inside outer join escape
sequences.
2) Wrong translation of parameter markers inside outer joins and function
escape sequences.
3) Bad concatenation of date, time, timestamp constants with next word in
statement:

src/interfaces/odbc/convert.h

@@ -40,8 +40,6 @@ int copy_and_convert_field(StatementClass *stmt, Int4 field_type, void *value, I
 					   PTR rgbValue, SDWORD cbValueMax, SDWORD *pcbValue);
 
 int			copy_statement_with_parameters(StatementClass *stmt);
-int		convert_escape(const char *value, StatementClass *stmt,
-			int *npos, int *stsize, const char **val_resume);
 BOOL		convert_money(const char *s, char *sout, size_t soutmax);
 char		parse_datetime(const char *buf, SIMPLE_TIME *st);
 int			convert_linefeeds(const char *s, char *dst, size_t max, BOOL convlf, BOOL *changed);