photobioloy R packages updated

I have updated all the photobiology packages. There are no major changes, so shouldn’t affect results of calculations or old scripts, except that there was an error in the definition of Green in photobiologyVis (reported by Titta, thanks!).

The documentation is hopefully improved: most packages have now User Guides

As earlier they can be downloaded from Bitbucket as binary (.zip for Windows) or source (.tar.gz). I could also create binaries for Linux if needed, just let me know.