Use long option names

This makes the script more self-documenting

Author: per1234

arduino-ci-script.sh

@@ -200,13 +200,13 @@ function install_ide()
     if [[ "$IDEversion" == "hourly" ]]; then
       # Deal with the inaccurate name given to the hourly build download
       wget --no-verbose $ARDUINO_CI_SCRIPT_QUIET_OPTION "http://downloads.arduino.cc/arduino-nightly-linux64.${downloadFileExtension}"
-      tar xf "arduino-nightly-linux64.${downloadFileExtension}"
+      tar --extract --file="arduino-nightly-linux64.${downloadFileExtension}"
       rm $ARDUINO_CI_SCRIPT_VERBOSITY_OPTION "arduino-nightly-linux64.${downloadFileExtension}"
       mv $ARDUINO_CI_SCRIPT_VERBOSITY_OPTION "arduino-nightly" "$ARDUINO_CI_SCRIPT_APPLICATION_FOLDER/arduino-${IDEversion}"
 
     else
       wget --no-verbose $ARDUINO_CI_SCRIPT_QUIET_OPTION "http://downloads.arduino.cc/arduino-${IDEversion}-linux64.${downloadFileExtension}"
-      tar xf "arduino-${IDEversion}-linux64.${downloadFileExtension}"
+      tar --extract --file="arduino-${IDEversion}-linux64.${downloadFileExtension}"
       rm $ARDUINO_CI_SCRIPT_VERBOSITY_OPTION "arduino-${IDEversion}-linux64.${downloadFileExtension}"
       mv $ARDUINO_CI_SCRIPT_VERBOSITY_OPTION "arduino-${IDEversion}" "$ARDUINO_CI_SCRIPT_APPLICATION_FOLDER/arduino-${IDEversion}"
     fi
@@ -548,7 +548,7 @@ function extract
       if [ -f "$n" ]; then
         case "${n%,}" in
           *.tar.bz2|*.tar.gz|*.tar.xz|*.tbz2|*.tgz|*.txz|*.tar)
-            tar xf "$n"
+            tar --extract --file="$n"
           ;;
           *.lzma)
             unlzma $ARDUINO_CI_SCRIPT_QUIET_OPTION ./"$n"