Add package qualifier with :: for optional if (require(gdata))
gdata::humanReadable(...) idiom per note from R CMD CHECK in -devel
version of R.



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/histogramtools@198 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Use the correct idiom suggested by writing r extensions for
conditional package inclusion from suggested.

http://cran.r-project.org/doc/manuals/r-patched/R-exts.html#Suggested-packages


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/histogramtools@199 edb9625f-4e0d-4859-8d74-9fd3b1da38cb