usrlocalpkg: Fix macs2, adjust python-3.8.9

Rationale: The macs2-utility from python-2.7.16 owns a
shared library that is incompatible with the recent glibc.

macs2 has been 'ported' to python3 in the meantime, so the
config needs to reflect this, whereas the old version just
remains defunct.

Also added: macs3, and stacked-git (stg)

usrlocalpkg/admin/config

@@ -568,7 +568,6 @@ python-2=python-2.7
 	pip2
 	ipython2
 	virtualenv2=virtualenv
-	macs2
 
 python2=python-2	# this has been published
 
@@ -1337,7 +1336,7 @@ python-3.7=python-3.7.7-0
 
 python3.7=python-3.7
 
-python-3.8=python-3.8.9-0
+python-3.8=python-3.8.9-1
 	python3.8
 	python3.8-config
 	pip3.8
@@ -1374,6 +1373,8 @@ python=python-3
   ipython
   jupyter
   jupyter-lab
+  macs2
+  macs3
   meson
   multiqc
   nbshow
@@ -1382,6 +1383,7 @@ python=python-3
   pip
   pyGenomeTracks
   snakemake
+  stg
   tadtool
   thonny
   umi_tools