Improve everything

• Fix typos
• More explicit README explanations with regard to executing setup.sh (and create_kernel.sh)
• Purge modules before loading
• Update module versions
• Quote all variables to handle spaces, for example.
• Support ZSH

activate.sh

 #!/bin/bash
-RELATIVE_PATH=`dirname ${BASH_SOURCE}`
-ABSOLUTE_PATH=`realpath ${RELATIVE_PATH}`
 
-[[ $0 != $BASH_SOURCE ]] && echo "The activation script must be sourced, otherwise the virtual environment will not work." || ( echo "Vars script must be sourced." && exit 1) ;
+# See https://stackoverflow.com/a/28336473
+SOURCE_PATH="${BASH_SOURCE[0]:-${(%):-%x}}"
 
-source ${ABSOLUTE_PATH}/config.sh
-source ${ABSOLUTE_PATH}/modules.sh
-
-export PYTHONPATH=`echo ${ENV_DIR}/lib/python*/site-packages`:${PYTHONPATH}
-
-source ${ENV_DIR}/bin/activate
+RELATIVE_PATH="$(dirname "$SOURCE_PATH")"
+ABSOLUTE_PATH="$(realpath "${RELATIVE_PATH}")"
 
+[[ "$0" != "${SOURCE_PATH}" ]] && echo "The activation script must be sourced, otherwise the virtual environment will not work." || ( echo "Vars script must be sourced." && exit 1) ;
 
+source "${ABSOLUTE_PATH}"/config.sh
+source "${ABSOLUTE_PATH}"/modules.sh
 
+export PYTHONPATH="$(echo "${ENV_DIR}"/lib/python*/site-packages):${PYTHONPATH}"
 
+source "${ENV_DIR}"/bin/activate