/usr/lib/R/site-library/xtable/NEWS is in r-cran-xtable 1:1.7-4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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  * Changed tags in HTML to be all lower case, to be compatible with
    HTML5, part of feature request(#5879)
  * Fixed booktabs bug (#2309), more of an enhancement really. Updated
    xtableGallery.snw to illustrate the change.
  * Moved vignettes from inst/doc to vignettes as now required by CRAN
  * Changed email address of David Dahl to dahl@stat.byu.edu in 9 places
1.7-3 (2014-03-06)
  * Released to CRAN
1.7-2 (2013-08-28, Not Released to CRAN)
  * Fixed HTML gsub bug (#2795)
  * Dealt with format.args bug (#4770). No code changes, but the
    documentation of print.xtable was changed to warn of the problem
    and to give a workaround as an example
1.7-1 (2013-02-24)
  * Fixed logicals bug (Req #1911)
  * Changed implementation of centering of tables. Instead of
    inserting a centered environment, now a \centering command is
    inserted. (Req #2104)
  * Allow for margin tables as possible with document class
    tufte-handout. An example of usage is found in the vignette
	produced by margintable.Rnw which is in inst/doc. (Req #2168)
  * Added "timestamp" argument to print.xtable().  Set it to NULL
    if no timestamp is desired. (Req #2246)
  * Added "comment" argument to print.xtable().  Set it to FALSE
    to exclude the version and timestamp comment. (Req #2246)
  * Added "caption.width" argument.  If not NULL then the caption
    is placed in a "parbox" of the specified width. (Req #2247)
  * Remove the check on whether the "floating.environment" is in a
    list of known floating environments. Users want to use floating
    environments from multiple options LaTeX packages (Req #2488,
    #2578)
1.7-0 (2012-02-10)
  * Added some vectorization code to improve performance.
  * Let "caption" be length 2, in which case the second value is
    the short caption used when creating a list of tables.
  * Added "toLatex" method.
  * Included "print.xtable" in the exported methods in the NAMESPACE file.
  * Added "print.results" argument to "print" that can be used to
    suppress the printing.
  * Added "format.args" argument to "print" that can be used to
    pass additional arguments such as "big.marks" to "formatC()".
  * Added "rotate.colnames" and "rotate.rownames" arguments to
    "print.xtable".
  * Added "booktabs" argument to use the "\toprule", "\midrule", and
    "\bottomrule" tags from the Latex "booktabs" package rather than
	using "\hline" for all horizontal lines.
  * Added "scalebox" argument to include a "\scalebox" clause around
    the tabular environment with the specified value used as the
    scaling factor.
  * Added "width" argument to allow specification of the width
    value in tabular environments such as "tabularx".
  * Added "X" as an allowed alignment value in the "align()"
    replacement function.
  * Changed the "print.xtable()" arguments to use "getOption()"
    to check the options for a default value.  This was suggested
	since "print.xtable()" has a lot of arguments that the user
	will typically leave unchanged between tables.
  * Added an "is.null()" check on the "table.placement" argument.
  * Added examples using the new arguments to the vignette.
1.6-0 (2011-10-07)
  * Allow "table*" as a value for "floating.environment" in print.xtable().
  * Fix bug under which multiple logical columns were formatted incorrectly.
  * Stop with an error if "xtable.table" is used on a table with more than
    two dimensions.
  * Add some newlines to "Rd" file to prevent lines from extending off the
    page in the PDF version of the help files.
  * Changed the maintainer to "Charles Roosen".
  * Created an "xtable" project on R-Forge.
1.5-6 (2009-10-30)
  * Support caption at the top in the LaTeX longtable.
  * Use options()$OutDec for decimal mark.
1.5-5 (2009-03-24)
  * Added html.table.attributes to set the attributed of the <TABLE> tag for HTML tables.
  * Accommodated logicals by converting to characters.
  * Add an extra space at end of each line for LaTeX tables.
  * Fixed typographical error in documentation.
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