HSQLDB changelogs for billing brought up to date

Patch responds to bug concerning VARCHAR size (see link below), but more generally, adds missing triggers and views to the liquibase changesets used with HSQLDB.  

Also: modified the DAO implementation to set the transaction isolation level to serializable, for correctness; added a few changes to the configuration file (mostly properties to enable parts of webadmin which were not previously enabled); in particular, an alarm server cell.

Note that I have taken the liberty of altering the original changelogs directly, as the liquibase tables are recreated on the fly each time (embedded db), at least for the moment.

Tested by doing multiple reads/writes.  Checked web pages (billing plots).

Target: trunk
Patch: http://rb.dcache.org/r/5261
Bug: http://rt.dcache.org/Ticket/Display.html?id=7665
Acked-by: Gerd
Acked-by: Paul
Require-notes: no
Require-book: no
Request: 2.5

modules/dcache/src/main/java/org/dcache/services/billing/db/impl/datanucleus/DataNucleusBillingInfo.java

@@ -133,6 +133,7 @@ public <T> void put(T data)
                 }
                 tx = insertManager.currentTransaction();
                 if (!tx.isActive()) {
+                    tx.setIsolationLevel("serializable");
                     tx.begin();
                 }
                 insertManager.makePersistent(data);

modules/system-test/src/main/skel/etc/layouts/system-test.conf

@@ -10,6 +10,9 @@ metaDataRepository=org.dcache.pool.repository.meta.db.BerkeleyDBMetaDataReposito
 srmSpaceManagerEnabled=yes
 replicaManager=yes
 billingToDb=yes
+generatePlots=true
+poolmanager.cache-hit-messages.enabled=true
+poolqplots.enabled=true
 
 [dCacheDomain]
 # The following is only defined for the domain to prevent that the CLI
@@ -19,6 +22,7 @@ dcache.java.options.extra=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,address
 [dCacheDomain/admin]
 adminHistoryFile=${dcache.home}/var/admin/history
 
+[dCacheDomain/alarms]
 [dCacheDomain/broadcast]
 [dCacheDomain/topo]
 [dCacheDomain/loginbroker]
@@ -41,7 +45,7 @@ replicaAdjustStartTimeout=10
 [dCacheDomain/httpd]
 authenticated=true
 transfersCollectorUpdate=10000
-webadminAdminGid=1
+webadminAdminGid=1000
 
 [dCacheDomain/statistics]