R remove out of date docs/utils

.. since we don't need RInside/Rcpp now.

[skip ci]

doc/user/RInside.txt

@@ -1,51 +0,0 @@
-Quick guide for developers on getting RInside built
-and installed to integrate with GoldenCheetah
-
-Make sure you have a working GC build already.
-
-1. install R
-
-2. install Rcpp
-
-R> install.packages("Rcpp")
-R> q()
-
-3. install RInside with callback enabled
-
-$ cd ~
-$ mkdir temp
-$ cd temp
-$ git clone https://github.com/eddelbuettel/rinside.git RInside
-$ vi RInside/inst/include/RInsideConfig.h
-
-we use vi, but use an editor of your choice
-uncomment the line from:
-// #define RINSIDE_CALLBACKS
-
-to look like this:
-#define RINSIDE_CALLBACKS
-
-$ R CMD INSTALL RInside
-
-The package is now installed and available to embed
-within GC, so we can now just delete the temp directory
-and contents we just created:
-
-4. cd ..
-5. rm -rf temp
-
-Now we can build GC with R enabled:
-
-6. cd <GoldenCheetah src directory>
-7. vi gcconfig.pri
-
-we use vi, but use an editor of your choice
-add the line:
-
-DEFINES += GC_WANT_R
-
-8. qmake
-9. make
-
-All should be good. If its working help>about>version
-should show the version of R that is embedded.

util/install-packages.R

@@ -1,13 +0,0 @@
-## R script to install packages for embedded R
-##
-## to run this script: 
-## $ R CMD BATCH install-packages.R
-## $ cat install-packages.Rout
-##
-## personal libs
-dir.create(Sys.getenv("R_LIBS_USER"), showWarnings = FALSE, recursive = TRUE)
-
-##We don't install a standard package anymore, since we need to build it
-##with callbacks enabled
-##install.packages("RInside", Sys.getenv("R_LIBS_USER"), repos = "http://cran.case.edu" )
-install.packages("Rcpp", Sys.getenv("R_LIBS_USER"), repos = "http://cran.case.edu" )