typed views, a function to delete a view and fixed view history bug

adapted size in the header, and added a boolean in the header indicating
whether the values should be evaluated (typically character strings to
be evaluated in Python)

columns are deleted when an OBIDMS is opened.

cloning API

using column names instead of pointers, and changed function names

of a view by an alias that can be modified.

view's name and created upon view creation.

both within and out of the context of a view

existing written view