true if CursorType is a cursor (as specified by isCursor) and also supports the
save method as specified here; false otherwise
Specification:
The type shall support at least:
all methods and aliases specified by isCursor
CursorType save(): returns an independent copy of the current cursor; the
copy must start at the position the original cursor was when this method
was called; the two copies shall be independent, in that advancing one
does not advance the other.
Checks whether its argument is a saveable cursor.
A saveable cursor is a cursor enhanced with a save method analogous to the save method of ForwardRanges.