save_attributes_to_db enhancements

[landam]

attributes = {}
pOSIdent = ...
for child in ...:
   name = child...
   if name == 'pOSIdent':
       pOSIdent = ...text
   else:
       attributes[name] = ...text

for name, value in attributes.item():
   col_name = col_cov(name)
   if col_name not in cols:
       col_name = col_conv_dict(name)
   if col_name not in cols:
      raise ... vs. continue...
   ... update