Imported R-R2HTML from pkgsrc-wip.

Imported R-R2HTML from pkgsrc-wip.

Includes HTML function and methods to write in an HTML output.
Thus, making HTML reports is easy. Includes a function that allows
redirection on the fly, which appears to be very usefull for
teaching purpose, as the student can keep a copy of the produced
output to keep all that he/she did during the course
Package comes with a vignette describing how to write HTML reports
for statistical analysis. Finally, a driver for Sweave allows to parse
HTML flat files containing R code and to automatically write the
corresponding outputs (tables and graphs).