changed proem to run id so its not a number to disambiguate from time…

setup.py

@@ -44,7 +44,7 @@
 
 setup(
     name='hio',
-    version='0.7.17',  #  also change in src/hio/__init__.py
+    version='0.7.18',  #  also change in src/hio/__init__.py
     license='Apache Software License 2.0',
     description='Hierarchical Concurrency with Async IO',
     long_description=("HIO Hierarchical Concurrency and Asynchronous IO Library. "

src/hio/__init__.py

@@ -3,7 +3,7 @@
 hio package
 """
 
-__version__ = '0.7.17'  # also change in setup.py
+__version__ = '0.7.18'  # also change in setup.py
 
 from .hioing import (Mixin, HioError, SizeError, ValidationError, VersionError,
                      HierError)

src/hio/base/hier/hogging.py

@@ -166,6 +166,8 @@ class Hog(ActBase, Filer):
                  clear=True, reuse=True, clean=True, filed=True,
                  extensioned=True, )
 
+    Proem = "__"  # prepended to rid (run ID) in header to ensure 24 bit boundary alignment
+
 
     def __init__(self, iops=None, nabe=Nabes.afdo, base="", filed=True,
                        extensioned=True, mode='a+', fext="hog", reuse=True,
@@ -325,7 +327,7 @@ def act(self, **iops):
                 # create B64 version of uuid with stripped trailing pad bytes
                 uid = encodeB64(bytes.fromhex(uuid.uuid1().hex))[:-2].decode()
                 #self.rid = self.name + "_" + uid
-                self.rid = "0A" + uid  # same as CESR salt
+                self.rid = self.Proem + uid  # same as CESR salt
             self.stamp = timing.nowIso8601()  # current real datetime as ISO8601 string
 
             metaLine = (f"rid\tbase\tname\tstamp\trule\tcount\n")