numberformat
ACTION: control how numbers are converted to strings
USE: change the format of numbers
EXAMPLE:
numberformat 3,0,0,0 : print 3.14159
'result: 3.142

REMARKS: there are 6 parameters:
1 decimal places (0..16)
2 strip trailing zeros (0 or 1)
3 always use scientic notation E format (0 or 1)
4 suppress 0 before decimal point: 0.1 becomes .1 (0 or 1)
5 insert extra leading space for non-negative numbers (0 or 1)
6 width allocated before decimal point: (0..31)
(inserting lead padding spaces)

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