Doc patch for Sys.time and system.time

Duncan noticed that either the sending server (Gmail - shouldn't be the
case) or receiving server stripped out the attachment.  Here it is again,
inline.

  -Ken

===========================

From 99766dd8f16804ecddc73f6169be3e42b916b8fa Mon Sep 17 00:00:00 2001

From: Ken Williams <Ken.Williams at WindLogics.com>
Date: Thu, 27 Dec 2012 09:58:21 -0600
Subject: [PATCH] Add system.time link to Sys.time documentation, and vice
  versa.


diff --git a/src/library/base/man/Sys.time.Rd
b/src/library/base/man/Sys.time.Rd
index d34571b..f0b0c50 100644
--- a/src/library/base/man/Sys.time.Rd
+++ b/src/library/base/man/Sys.time.Rd
@@ -41,6 +41,8 @@ Sys.Date()
    string.

    \code{\link{Sys.timezone}}.
+
+  \code{\link{system.time}} for measuring elapsed/CPU time of expressions.
  }
  \examples{\donttest{
  Sys.time()
diff --git a/src/library/base/man/system.time.Rd
b/src/library/base/man/system.time.Rd
index 5cd79b7..ad21267 100644
--- a/src/library/base/man/system.time.Rd
+++ b/src/library/base/man/system.time.Rd
@@ -38,6 +38,8 @@ unix.time(expr, gcFirst = TRUE)
  }
  \seealso{
    \code{\link{proc.time}}, \code{\link{time}} which is for time series.
+
+  \code{\link{Sys.time}} to get the current date & time.
  }
  \examples{
  require(stats)