usrlocalpkg: switch to python-3.9

Summary:

 - meson version is now 0.59.0
 - snakemake is 6.6.1
 - pdbfixer is used by AlphaFold, so it is in the path.

usrlocalpkg/admin/config

@@ -1362,7 +1362,7 @@ python3.9=python-3.9
 
 # b) default python, see PEP 0394 too
 
-python-3=python-3.8
+python-3=python-3.9
 	python3
 	python3-config
 	idle3=idle
@@ -1373,7 +1373,7 @@ python-3=python-3.8
 python3=python-3
 
 # c) manage python based tools (meson, snakemake, ...)
-# mind python3-wrapper.be0
+# Check existence! And mind python3-wrapper.be0 too
 
 python=python-3
   bamCompare
@@ -1395,6 +1395,7 @@ python=python-3
   multiqc
   nbshow
   pairtools
+  pdbfixer
   pgt
   pip
   pyGenomeTracks