gers (pads to given length).

 USAGE
  nstr = int2str2( n, [nDigits] )

 INPUTS
  n        - integer to convert to string
  nDigits  - [0] minimum number of digits to use

 OUTPUTS
  nstr     - string repr. of n (or cell array of strings if n is array)

 EXAMPLE
  s = int2str2( 3, 3 ) % s='003'

 See also INT2STR

 Piotr's Computer Vision Matlab Toolbox      Version 1.5
 Copyright 2014 Piotr Dollar.  [pdollar-at-gmail.com]
 Licensed under the Simplified BSD License [see external/bsd.txt]<