updated CHANGES.md [ci skip]

CHANGES.md

@@ -1,5 +1,30 @@
 # ChangeLog
 
+## v3.6.0
+
+* PET:
+  - added extra members to ScatterEstimation to set behaviour of OSEM used during scatter estimation
+  - added test for scatter simulation and estimation
+  - added missing `set`/`get` methods for OSSPS `relaxation_parameter`, `relaxation_gamma` and `upper_bound`.
+
+* CMake/building:
+  - default `DISABLE_MATLAB` to `ON` as our Matlab support is out-of-date and could
+  generate conflicts with Python shared libraries.
+
+* Demo scripts:
+  - replaced importing reconstruction engines by
+```
+ exec('from sirf.' + args['--engine'] + ' import *')
+```
+  with importing via `importlib.import_module` thus getting rid of Codacy complaints about undefined modules.
+
+* Python interfaces for the reconstruction engines:
+  - Several allocate methods in STIR.py, Gadgetron.py and Reg.py are replaced with just one allocate in DataContainer class that does not copy data between Python and C++.
+  - `return None` in the method `Datacontainer.shape()` replaced with more Pythonesque `return (0,)`.
+
+* MR
+  - Handling of "irregular" ISMRMRD acquisitions hit what appears to be a bug in recent Gadgetron (HEAD detached at 0670db84). A quick fix applied, Gadgetron issue to be raised.
+
 ## v3.5.0
 
 * GitHub Action: remove temporarily the Ubuntu 20.04 build, #1178