wip: dir organisation, script cleanup

scripts/install/10-pyenv.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+if not_installed "pyenv"; then
+    # see https://github.com/pyenv/pyenv/wiki/common-build-problems
+    pyenv_list_file="$INSTALL_DIR/10-pyenv-pkglist"
+    install_file "$pyenv_list_file"
+
+    # see https://github.com/pyenv/pyenv-installer
+    run "https://github.com/pyenv/pyenv-installer/raw/master/bin/pyenv-installer" \
+        bash
+fi
+
+export PATH="$HOME/.pyenv/bin:$PATH"
+eval "$(pyenv init -)"
+eval "$(pyenv virtualenv-init -)"
+
+pyenv update
+
+pyenv --version