date_format and debug_print_var

hi! i've got a few suggestions concerning these two modifiers: 1. print_debug_var: i've modified it to output information about object-attributes, too. i think this is missing in the orginal one. 2. date_format: i've modified it to output nothing instead of the current time if the variable is empty. i think this way is closer to the suggested behavior. perhaps it is possible to take these modifications in the next release, because i think most people find them handy. i would be glad about any statments. thanks, rainer