Chooser units

The chooser application displays and accepts the SI prefixes for powers of 1000. This allows values to be entered concisely over a vast range of values. The SI prefixes are:

P	Peta - 10¹⁵
T	Tera - 10¹²
G	Giga - 10⁹
M	Mega - 10⁶ NB upper case
k	kilo - 10³
m	milli - 10^-3 NB lower case
u	micro - 10^-6
n	nano - 10^-9
p	pico - 10^-12
f	femto - 10^-15
a	atto - 10^-18

Note that the prefixes are case sensitive.