Add TODO comment to test removal of unnecessary installations

R_3.6_outrider.def

@@ -27,6 +27,7 @@ add-apt-repository "deb https://cloud.r-project.org/bin/linux/ubuntu bionic-cran
 apt update
 
 apt-get install -y --no-install-recommends -t bionic-cran35 r-base=${R_VERSION}-1bionic r-recommended=${R_VERSION}-1bionic r-base-core=${R_VERSION}-1bionic r-base-dev=${R_VERSION}-1bionic r-base-html=${R_VERSION}-1bionic r-doc-html=${R_VERSION}-1bionic
+# TO DO : test removing of r-base-core, r-doc-html and r-base-html which in theory are not necessary. Or replace r-base with r-base-core to remove R documentation and lighten the image.
 
 apt-get install -y --no-install-recommends libcurl4-openssl-dev libxml2-dev libssl-dev libfontconfig1-dev libharfbuzz-dev libfribidi-dev libfreetype6-dev libpng-dev libtiff5-dev libjpeg-dev