Make client caches respect CLIENT_HOME

src/ZEO/ClientCache.py

@@ -144,7 +144,7 @@ file 0 and file 1.
 
 """
 
-__version__ = "$Revision: 1.13 $"[11:-2]
+__version__ = "$Revision: 1.14 $"[11:-2]
 
 import os, tempfile
 from struct import pack, unpack
@@ -164,6 +164,8 @@ class ClientCache:
         if client:
             # Create a persistent cache
             if var is None:
+                try: var=CLIENT_HOME
+                except:
                     try: var=os.path.join(INSTANCE_HOME,'var')
                     except: var=os.getcwd()