Add central variable setting bootstrap directory

Prepare for moving bootstrap directory to conform to new ignore pattern
of autostow.sh script. Bootstrap directory can be overwritten through
environment variable BOOTSTRAP_DIRECTORY, however for now it still
rigidly requires the existence of an install_packages.sh file and an
autostow.sh file which it wants to execute.

install.sh

@@ -8,13 +8,15 @@
 #
 # Will symlink all my dotfiles into their correct places using autostow.sh
 
+bootstrap_dir="${BOOTSTRAP_DIRECTORY:-./bootstrap}"
+
 main() {
   local cmd=""
   local ret=0
 
   case "$1" in
   -v | --version)
-    printf "Personal system bootstrap script.\n\n©Marty Oehme\n\nVersion: 0.1\n"
+    printf "Personal system bootstrap script.\n\n©Marty Oehme\n\nVersion: 0.1.1\n"
     ;;
   -h | --help)
     printf "Usage: install [-f|--force][-v|--version][-h|--help]\n\n-f     Do not ask for any confirmations but force update and installation.\n"
@@ -50,15 +52,15 @@ install() {
   echo "====================== BEGINNING INSTALLATION ============================="
   if ! "$unattended"; then
     export BOOTSTRAP_PACKAGES="bootstrap/packages.csv"
-    ./bootstrap/install_packages.sh
+    "$bootstrap_dir"/install_packages.sh
   else
     export BOOTSTRAP_PACKAGES="bootstrap/packages.csv"
-    ./bootstrap/install_packages.sh -f
+    "$bootstrap_dir"/install_packages.sh -f
   fi
   unset BOOTSTRAP_PACKAGES
 
   echo "=================== BEGINNING DOTFILE MANAGEMENT =========================="
-  ./bootstrap/autostow.sh -s
+  "$bootstrap_dir"/autostow.sh -s
 
   echo "====================== INSTALLATION FINISHED =============================="