Remove bugs of removed code from BUGS.rst.

Some of the other bugs might have been already fixed
as well, this has to be reviewed, and also doxygenised.

BUGS.rst

@@ -23,28 +23,6 @@ Plane wave decompositions gives wrong value on the longitudinal part.
 The implementation of the L coefficients OR the longitudinal waves
 is thus probably wrong.
 
-Scattering result asymmetry
----------------------------
-The lattice scattering code (such as finitesqlatzsym-scattery.py) produces
-asymmetric results where one should not get them, due to the system symmetry.
-
-It seems that the asymmetry appears mostly in the y-direction (i.e.
-for example the scattering/absorption cross section at k = (kx, ky, kz)
-is not exactly the same as k = (kx, -ky, kz).
-
-What has been checked (hopefully):
- - The flip operators for electric waves
- - Some weird kind of rounding or other numerical error depending on
-   the position ordering of the matrix (randomized indices give
-   the same asymmetry).
-
-What has not been checked (so well):
- - The x,y,z-flip operators for magnetic waves (i.e. are they really 
-   supposet to bejust the
-   same as the operators for electric waves, just with opposite sign?) 
- - zplane_pq_y
- - the translation operators
-
 
 Singular value asymmetry
 ------------------------
@@ -60,6 +38,3 @@ Moreover, the non-normalized legendre functions that are used in translations.c
 are likely to overflow for even smaller values of l. 
 Therefore TODO: modify translations.c in a way that uses normalised legendre functions everywhere.
 
-Memory management
------------------
-When compiled with optimizations, I get stack smashing error in  qpms_trans_calculator_get_2DFT_longrange_AB_arrays().