Log Message:
Update 1.68 to 1.70
-------------------
1.70 Sat Jan 25 06:44:12 PST 2014
  - Minor patch to 1.69, as encoding function is only reliably supported
  by Perl newer than v5.8.1.

  - Patch internal method openFileWithEncoding(), so that older Perl
  version will not give an error.

  - Fixed a warning in fromFileGuessOS, introduced in 1.69.

1.69 Tue Jan 14 10:22:19 PST 2014

  Fix a minor bug in pivot() related to colToSplitIsStringOrNumeric.

  Integer column names are allowed. However, fromFile by default does
  not take numeric column names, unless allowNumericHeader is set to
  1.
  Patch fromFile(), checkHeader(), colIndex(), fromFileIsHeader(), \ 
fromFileGetTopLines()
  to support numeric column header.
  An integer is first interpreted as a column name. Therefore,
  accessing a column by its ordinal number may not be possible, if the
  number is used as a column name. In such case, first fetch the
  corresponding column name and access by name.

  Support file encoding methods in fromFile, fromCSV, fromTSV.  E.g.,
  fromCSV("filename, 1, undef, {encoding=> 'UTF-8'}) UTF-8 is the
  default encoding, can be controlled by
  $Data::Table::DEFAULTS{ENCODING}.  Thanks to questions asked by
  Sergio Basto and Thomas Hofmann.

  If an integer is passed to colIndex(), it is interpreted as string
  first for column lookup.  fromFile by default will allow numeric
  headers (but not all column headers can be numeric).

  support skip_empty in melt();