Added "post-type" of output

When there are several post-type, it is interesting to selected on a
post-type a selection of other "post-type"
For example: you have a post-type"problem" in which you wish lists from
a post-type"case study"
the additional field "Selected the "post-type" of output" will allow
you to do a page by selecting "problematic", post-type"case study"