replace pu_print_pkgspec with pu_fprint_pkgspec

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
pacsift: initialize search lists to NULL

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
pacsift: add --group search option

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
pacsift: add option to search cached packages

Marked as experimental due to how slow it is and the potential for it to
be replaced by a more generic --directory option.

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
pacutils.c: plug config_t memory leaks

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>