Tekton: fix agent for R-0.5-main builder.
Tekton: provision dependencies of the R package.
Tekton: fix passing arguments from run-script to vagrant.
Tekton: fix agent unload script, xargs was not working.
Tekton: add apt-get update provisioner.
Tekton: fix mode of provisioners, need +x.
Tekton: agents and script to check R package.
Tekton: R builder uses 'make parsersources'.
Tekton: R builder gets package name from DESCRIPTION file.
Tekton: agent to built R package from 0.7-graphlets tree.
Tekton: use AddressSanitizer to check R package.