#1 Format number with leading zeroes

[Bill Ward]

From: Domenico Viggiani <viggiani@pitagora.it> 1 Sep 1998

I'd like very much to have a function to format a
number eventually inserting leading zeroes in front of
it. For istance: format_picture(100.023, '##,###.##')
yields '000100.02' format_picture(1000.023,
'##,###.##') yields '01,000.02'

[Bill Ward]

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Comment from TODO file:

How about: '0#,###.##' yields '01,000.02' but '##,###.##'
yields ' 1,000.02'?