Split conda activate into three cases

1) No env active, just activate the flepiMoP env.
2) The flepiMoP env is active, go ahead and refresh it because
   `module load anaconda` modifies the paths.
3) Another conda env is active, deactivate it with a message.

batch/hpc_init.sh

@@ -53,13 +53,14 @@ if [ -z "${FLEPI_CONDA}" ]; then
     echo "Using '$FLEPI_CONDA' for \$FLEPI_CONDA."
 fi
 CURRENT_CONDA_ENV=$( conda info | grep "active environment" | awk -F ':' '{print $2}' | xargs )
-if [ "$CURRENT_CONDA_ENV" != "None" ] && [ "$CURRENT_CONDA_ENV" != "$FLEPI_CONDA" ]; then
-    echo "Detected an active conda environment '$CURRENT_CONDA_ENV'. This will be deactivated and the '$FLEPI_CONDA' environment will be activated."
+if [ "$CURRENT_CONDA_ENV" = "$FLEPI_CONDA" ]; then
+    echo "Detected the activate conda environment is '$FLEPI_CONDA' already, but will refresh."
+    conda deactivate
+elif [ "$CURRENT_CONDA_ENV" != "None" ]; then
+    echo "Detected an active conda environment '$CURRENT_CONDA_ENV'. This will be deactivated and the '$FLEPI_CONDA' environment wil be activated."
     conda deactivate
 fi
-if [ "$CURRENT_CONDA_ENV" == "None" ] || [ "$CURRENT_CONDA_ENV" != "$FLEPI_CONDA" ]; then
-    conda activate $FLEPI_CONDA
-fi
+conda activate $FLEPI_CONDA
 
 # Check the conda environment is valid
 WHICH_PYTHON=$( which python )