On Ubuntu 16.04 x86_64 Xeon E5-2623 + 16 GB RAM, from a fresh git clone + 
pull develop, parallel (-j8) build OK and make ptestlong resulted in all 
tests passed. 

However, I've noted some regression, most probably due to the upgrade to 
Maxima 5.39 introduced in #18920: the hyperbolic plane worksheet 
<http://nbviewer.jupyter.org/github/sagemanifolds/SageManifolds/blob/master/Worksheets/v1.0/SM_hyperbolic_plane.ipynb>
 
fails at Out[35] with "The kernel appears to have died". A minimal code to 
reproduce it is

sage: H = Manifold(2, 'H')
sage: X.<r,ph> = H.chart(r'r:(0,+oo) ph:(0,2*pi):\varphi')  # standard 
polar coord. in the plane
sage: Y.<R,ph> = H.chart(r'R:(0,1) ph:(0,2*pi):\varphi')   # coord. for the 
Poincaré disk model
sage: X_to_Y = X.transition_map(Y, [r/(1+sqrt(1+r^2)), ph])
sage: X_to_Y.display()
R = r/(sqrt(r^2 + 1) + 1)
ph = ph
sage: X_to_Y.set_inverse(2*R/(1-R^2), ph, verbose=True)

;;;
;;; Detected access to protected memory, also kwown as 'bus or segmentation 
fault'.
;;; Jumping to the outermost toplevel prompt
;;;

Erreur de segmentation (core dumped)

Eric.

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