Add PR numbers upstream

Custom_EasyBlocks/README.md

@@ -14,21 +14,21 @@ Overview of the custom EasyBlocks.
 - __*added by*__ d.alvarez
 - __*needed because*__ optional `check_static_libs` parameter in the sanity check (used with `psmpi.py`)
 - __*difference compared to upstream*__ the aforementioned parameter
-- __*can not be removed*__ at least until that option (needed just for `psmpi.py`) is merged upstream
+- __*can not be removed*__ at least until that option (needed just for `psmpi.py`) is merged upstream (PR: #2787)
 
 ## PSMPI
 
 - __*added by*__ d.alvarez
 - __*needed because*__ CUDA support
 - __*difference compared to upstream*__ the supporting code to enable CUDA support
-- __*can not be removed*__ until the CUDA options are pushed upstream
+- __*can not be removed*__ until the CUDA options are pushed upstream (PR: #2787)
 
 ## OPENMPI
 
 - __*added by*__ d.alvarez
 - __*needed because*__ the check for `mpirun` should be optional
 - __*difference compared to upstream*__ making that check optional
-- __*can not be removed*__ until the check is made optional upstream
+- __*can not be removed*__ until the check is made optional upstream (PR: #2788)
 
 ## CODE_SATURNE