Problem with PyRosetta install

Dear Rosetta gurus,

I thought I was pretty fluent in python, yet, I stumble on serious problems while trying to use D020_Pose_scoring.py -- essentially a rosetta package is missing.
thus, I had two questions:

1. do I miss a key install recommendation?
2. since I am interested in scoring, is there a tutorial on the C++ functionalities offered for scoring?

thanks a lot and best regards, Frederic Cazals.

-- we installed rosetta and set the following env. variables:

setenv ROSETTA ${HOME}/PACKAGES/INSTALL/x86_64/rosetta/rosetta_2014.18.56749_bundle
setenv PYTHONPATH ${ROSETTA}/tools/protein_tools/rosettautil:${ROSETTA}/main/source/src/python/bindings/src

-- we tried to play with the demos in
$ROSETTA/main/source/src/python/bindings/demos, but faced various errors:

cabestan-fcazals> python D020_Pose_scoring.py
Traceback (most recent call last):
File "D020_Pose_scoring.py", line 67, in <module>
from PyMolLink import *
File "/user/fcazals/home/PACKAGES/INSTALL/x86_64/rosetta/rosetta_2014.18.56749_bundle/main/source/src/python/bindings/src/PyMolLink.py", line 29, in <module>
import rosetta.core.pose
ImportError: No module named core.pose

PROBLEM 1:

$ROSETTA/main/source/src/python/bindings/src/PyMolLink.py contains
56:from rosetta.PyMolLink import *

QUESTION: where is the package rosetta?

PROBLEM 2:

if we change the previous import by removing the rosetta. that is

from PyMolLink import *

and since PYTHONPATH contains the source directory containing
PyMolLink.py, we expect good news. unfortunately:

cabestan-fcazals> python D020_Pose_scoring.py
Traceback (most recent call last):
File "D020_Pose_scoring.py", line 67, in <module>
from PyMolLink import *
File "/user/fcazals/home/PACKAGES/INSTALL/x86_64/rosetta/rosetta_2014.18.56749_bundle/main/source/src/python/bindings/src/PyMolLink.py", line 29, in <module>
import rosetta.core.pose
ImportError: No module named core.pose

QUESTION AGAIN: we do not find the rosetta package with
core/protocols/etc as sub-directories?

Indeed:

cabestan-fcazals> cd $ROSETTA
cabestan-fcazals> find . -name rosetta
./main/source/src/python/apps/public/protein_tools/rosettautil/rosetta
./tools/protein_tools/rosettautil/rosetta

but none of these directories contains: core protocols etc

-- these directories are in $ROSETTA/main/source/src/python/bindings/src