st: Return data characteristics after describe with replace option

[Jeremy Page <miahpage@gmail.com>]

I am using the command -describe- with the replace option to generate
a new dataset. The help file indicates that thing such as the
filename, date, N and sort order are retained as characteristics. Are
these characteristics stored? If so, how do I return them? I have
pasted the information from the help file below.

Best,
Jeremy

    In addition, the data contain the following characteristics:

            _dta[d_filename], the name of the file containing the original data.

            _dta[d_filedate], the date and time the file was written.

            _dta[d_N], the number of observations in the original data.

            _dta[d_sortedby], the variables on which the original data
were sorted, if any.
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