respond to cran

cran-comments.md

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 * This is a new release.
+
+## Changes in this resubmission
+
+> Package names are case sensitive. (in title:) --> 'xaringan' 
+
+The title was changed accordingly.
+
+> Please do not modify the global environment (e.g. by using <<- or  
+> assign() without a specified environment) in your functions. 
+
+`assign()` is used but always with an explicit environment to ensure
+that the global environment is not modified.
+
+> Please make sure you do not write or download anything without the 
+> user's permission.
+
+I've verified that all file outputs are consented, either by setting a function
+argument to the path of an outfile or by prompt. In one case where a required
+file needs to be downloaded, the user's consent is requested prior to the
+download. If the user consents, the file is downloaded into the temp folder.
+
+> Please make sure that you do not change the user's options, par or 
+> working directory.
+
+The global options are not modified by any functions in the package. There are
+a few places in the tests where options are temporarily modified for the test,
+but the options are reverted when exiting the scope of the test.
+
+> Missing Rd-tags: \value, \arguments
+
+I've added the missing Rd tags in all files.