install script refactoring: tnl-bindir does not exist anymore, check $PATH directly

PREFIX=${HOME}/.local

for option in "$@"

do

for option in "$@"; do

    case $option in

        --prefix=*) PREFIX="${option#*=}" ;;

    esac

done

TNL_TEST=`which tnl-bindir`

if [[ ! "$PATH" =~ "$PREFIX/bin" ]]; then

    cat << EOF

WARNING !!!

if test x${TNL_TEST} = x;

then

    echo ""

    echo "WARNING !!!"

    echo ""

    echo "Your system does not see TNL which was installed right now."

    echo "You need to add it to your system variables PATH and LD_LIBRARY_PATH."

    echo "Add the following to your .bashrc file:"

    echo ""

Your system does not see TNL which was installed right now.

You need to add it to your system variables PATH and LD_LIBRARY_PATH.

Add the following to your .bashrc file:

    echo "if test x\${PATH} = x;"

    echo "then"

    echo "   PATH=${PREFIX}/bin"

    echo "else"

    echo "   PATH=\${PATH}:${PREFIX}/bin"

    echo "fi"

    echo "if test x\${LD_LIBRARY_PATH} = x;"

    echo "then"

    echo "   LD_LIBRARY_PATH=${PREFIX}/lib"

    echo "else"

    echo "   LD_LIBRARY_PATH=\${LD_LIBRARY_PATH}:${PREFIX}/lib"

    echo "fi"

    echo "export PATH"

    echo "export LD_LIBRARY_PATH"

export PATH="\${PATH}:${PREFIX}/bin"

export LD_LIBRARY_PATH="\${LD_LIBRARY_PATH}:${PREFIX}/lib"

EOF

fi