* breakpoint.c (breakpoint_re_set): Select a default source

	* breakpoint.c (breakpoint_re_set):  Select a default source
	symtab if one is not currently selected.
	* utils.c (query):  Call wrap_here before building the output
	query string, to turn off wrapping and flush any buffered output.
	Otherwise our query may end up in the wrap buffer and never be
	seen by the user.
	* eval.c (evaluate_subexp):  Report error when attempting to
	evaluate subscript for types without a target type, rather
	than dumping core by using the NULL pointer.
	* symfile.c (symbol_file_command):  Forget current_source_symtab
	and current_source_line when discarding symbol table.