FSTRING

    Wrapper around STRING function to fix pre-V5.4 1024 formatting size limit

    Prior to V5.4, the intrinsic STRING() function had a size limit of 1024
    elements. FSTRING() works around this by breaking a larger array into 1024 element
    element chunks.

    new = fstring(old, [ format, FORMAT = )

    OLD = string or number to format, scalar, vector or array

    FORMAT = scalar string giving format to pass to the STRING() function
             See restrictions on possible formats below.

    FORMAT  = Format string can alternatively be called as keyword

    FSTRING will return a string with the same dimensions

    Because FSTRING breaks up the formatting into 1024 element chunks, problems
    can arise if the number of formatting elements does not evenly divide
    into 1024.    For example, if format = '(i6,f6.2,e12.6)', (i.e. three
    formatting elements)  then both the 1023rd and 1024th element will be
    formatted as I6.

    Create a string array of 10000 uniform random numbers formatted as F6.2
    IDL> a = fstring( randomu(seed,10000), '(f6.2)')

     Written W. Landsman (based on program by D. Zarro)  February 2000
     Check if VERSION is V5.4 or later   W. Landsman     January 2002

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