Improved appearance of help pages (text, html, pdf):
* Adjusted line wraps (some lines in dplR.pdf were too long, some
  unnecessary line breaks were present in the html)
* Unified the formatting of references
* Shortened the title of interseries.cor.Rd
* Each \keyword entry must be on one line (strip.rwl.Rd created a
  spurious empty help topic to the Index of dplR.pdf)
* Fixed some typos, etc.


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/dplr@850 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
svn:eol-style set where it was missing

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/dplr@851 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Completed an unfinished sentence. Andy: Did I make a good guess?

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/dplr@852 edb9625f-4e0d-4859-8d74-9fd3b1da38cb