refactoring changes from sequpgrade (endReturn, ...) and some modernizations

seqs/calibreweb.sh

@@ -48,7 +48,7 @@ step_2() {
   fi
   if [ ! -e "$CALWEB_VENV_ROOT/bin" ]; then
     exe python3 -m venv "$CALWEB_VENV_ROOT"
-    endReturn -o $? "Creating virtual environment failed"
+    endReturn "Creating virtual environment failed"
     exe chown -R ${CALWEB_USER}: "$CALWEB_BASE"
   else
     warning "Virtual env. $CALWEB_VENV_ROOT already exists"
@@ -61,7 +61,7 @@ step_3() {
   exe ${CALWEB_VENV_ROOT}/bin/pip install $toolPipName
 }
 
-step_4_info() { 
+step_4_info() {
   echo "Install $toolName features"
   echoinfo ${toolFeatures[*]}
 }