left and right arrows enabled for making homogeneous collections, also removed code on right shift to save the collection element
condition added for metadata saving for node
removed code on right shift of collection elements in collection drawers
removed unecessary code, since while on click of save button all metadata and its collections can be saved
code modified according to save the collections such as prior node ,teaches ,assesses and metadata on click of save button, also bug resolved in removing collections
removed unecessary code fo saving metadata and teaches, and assesses lists while editing page node