TODO

Make a private mode for `type'

Make a global mode for `open_*' 

Create a `dirty' variable so it knows when to cleanup.

Find out how to accelerate `type' mode.

use `isa' to test paramenter types

correct syntax problems due to accepting ( [ 1 .. 10 ] ) as input - see POD.

fix Bigfloat tests

Quantize_Date should care of daylight savings time