tadd cngf-pf, master branch - cngf-pf-exp2 - experiments for second paper with continuum granular model
 (HTM) git clone git://src.adamsgaard.dk/cngf-pf-exp2
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       ---
 (DIR) commit c5fa926d91065d4a893101511e77e32c9c80a193
 (HTM) Author: Anders Damsgaard <anders@adamsgaard.dk>
       Date:   Wed,  4 Aug 2021 13:23:53 +0200
       
       add cngf-pf, master branch
       
       Diffstat:
         A .gitmodules                         |       3 +++
         A cngf-pf                             |       1 +
       
       2 files changed, 4 insertions(+), 0 deletions(-)
       ---
 (DIR) diff --git a/.gitmodules b/.gitmodules
       t@@ -0,0 +1,3 @@
       +[submodule "cngf-pf"]
       +        path = cngf-pf
       +        url = git://src.adamsgaard.dk/cngf-pf
 (DIR) diff --git a/cngf-pf b/cngf-pf
       t@@ -0,0 +1 @@
       +Subproject commit 42c19a2153e87567144da2821a3d51aa156ed017