Primordial layer (#72)

* Enables to read primordial layer files

* Change the name of the primordial layer field to "prim" and enables to read
hdf5 primordial layer files

Co-authored-by: Thomas Frasson <[email protected]>

Author: tfrass49

stagpy/phyvars.py

@@ -40,6 +40,7 @@
     ('rs2', Varf('y Momentum residue', '1')),
     ('rs3', Varf('z Momentum residue', '1')),
     ('rsc', Varf('Continuity residue', '1')),
+    ('prim', Varf('Primordial layer', '1')),
 ))
 
 FIELD_EXTRA = OrderedDict((
@@ -61,6 +62,7 @@
     ('sx', ['sx1', 'sx2', 'sx3', 's1val']),
     ('ed', ['edot']),
     ('tcond', ['Tcond1', 'Tcond2', 'Tcond3']),
+    ('prm', ['prim']),
 ))
 
 FIELD_FILES_H5 = OrderedDict((
@@ -82,6 +84,7 @@
     ('Stress', ['sII']),
     ('PrincipalStressAxis', ['sx1', 'sx2', 'sx3']),
     ('StrainRate', ['edot']),
+    ('Primordial', ['prim']),
 ))
 
 SFIELD = OrderedDict((