- enhanced Quantity.extract()
* non-conforming lines are now ignored
* values may be expressions
* values need not be quantities
* can specify a quantity name distinct from dictionary name
- enhanced the formatting capabilities.
* added center alignment
* added *p* format
* added *show_commas* preference.
* added *strip_zeros*, *strip_radix* to Quantity.render()
* added Quantity.fixed() method
* added Quantity.format() method
* support any format specifier supported by Python for floats