#368 Issues with the Model Creator and Editor nodes handling literature items

[Miguel de Alba Aparicio]

It seems there are two issues with these nodes:
The Model Creator node writes out the literature into the M_Literature column instead of the EM_Literature column
The Model Editor node takes the literature items from M_Literature and writes them out in EM_Literature. The original entries in M_Literature are deleted.

[Armin Weiser]

please check, new check boxes added to the literature list for clear associations