# <p>
# Process a <b>properly formatted</b> CSV file.
#   You can change the separator from the default <tt>,</tt>
#   to any set of characters using the <tt>--separator=CSET</tt>
#   argument.
# </p>
# <p>
#   Each separator denotes a field separation (e.g. "a,,,b,"
#   contains five fields) unless you give the <tt>--span</tt> argument.
#   If you give the <tt>--span</tt> argument, then the fields
#   as considered to be separated by <i>one or more</i> spans
#   of the separator instead of exactly one and the above input
#   contains three fields instead of five (in both cases, the last
#   field is the empty string).
# </p>
# <p>
#  Assumes that:<br><br>
#  a. Fields containing the separator are enclosed in double
#     quotes.<br>
#  b. Fields containing double quotes have those quotes
#     duplicated with the entire field inclosed in double
#     quotes.<br>
#  c. Leading and trailing whitespace (blanks and tabs) are
#     to be removed unless used as separators.<br>
#  d. Double quotes and newlines are <i>never</i> separators.<br>
#</p>