adding CK_PYTHON env to let users select appropriate python for CK script

Author: gfursin

CHANGES.txt

@@ -1,4 +1,6 @@
 * V1.6.12
+  * adding CK_PYTHON env variable in ck script 
+    to let user select required python version (python or python3)
   * automatically detecting python3 or python on Linux
   * fixing license of a php OpenME code - now the same as CK
     (tiny part to connect PHP-based web requests to CK)

bin/ck

@@ -10,6 +10,10 @@ if [ -z "$CK_ROOT" ]; then
 fi
 
 # Check which python to use
+if [ "$CK_PYTHON" != "" ]; then
+   export PYTHON=$CK_PYTHON
+fi
+
 if [ -z "$PYTHON" ]; then
    if $(python3 --version &> /dev/null) ; then
       export PYTHON=python3
@@ -18,6 +22,8 @@ if [ -z "$PYTHON" ]; then
    fi
 fi
 
+echo $PYTHON
+
 # Load kernel module (either GIT/local installation or as package)
 if [ -f "$CK_ROOT/ck/kernel.py" ]; then 
  $PYTHON -W ignore::DeprecationWarning $CK_ROOT/ck/kernel.py "$@"