moved elements host info to new sub-dictionary
removed unused and duplicate element info entry
host_info element info entry is now always populated
made some internet buttons in the editor small
now using a flag "show_as_common" in external networks to decide which networks are common elements in the editor (like templates)
Merge pull request #539 from t-gerhard/internet_button2

made some internet buttons in the editor small
Merge pull request #530 from t-gerhard/element_host_info

moved elements host info to new sub-dictionary