HER-1627 followup: show error rather than match faulReadSize

* PersistProcessor.java
    rename setupEnvironment to setupCopyEnvironment to make limited purpose of env clear; catch and rethrow IllegalArgumentException with hint that second-open may be cause
* PersistLoadProcessor.java 
    catch and display IllegalArgumentException same as other failure-to-open SEVERE but proceedable exceptions
* PrecedenceLoader.java
    update method names

engine/src/main/java/org/archive/crawler/frontier/precedence/PrecedenceLoader.java

@@ -105,7 +105,7 @@ public class PrecedenceLoader {
         }
         
         // setup target environment
-        EnhancedEnvironment targetEnv = PersistProcessor.setupEnvironment(env);
+        EnhancedEnvironment targetEnv = PersistProcessor.setupCopyEnvironment(env);
         StoredClassCatalog classCatalog = targetEnv.getClassCatalog();
         Database historyDB = targetEnv.openDatabase(
                 null,