Ok, so I reimported my data and performed the migration again.

Now I have better view on exceptions that occurred at startup time :

**************
2009-05-06 20:11:50,892 [http://vanille:8080/xwiki/bin/view/Main/WebHome]
[http-8080-Processor25] INFO  .AbstractXWikiMigrationManager  - Current
storage version = [7351] 
2009-05-06 20:11:50,914 [http://vanille:8080/xwiki/bin/view/Main/WebHome]
[http-8080-Processor25] INFO  .AbstractXWikiMigrationManager  - List of
migrations that will be executed: 
2009-05-06 20:11:50,915 [http://vanille:8080/xwiki/bin/view/Main/WebHome]
[http-8080-Processor25] INFO  .AbstractXWikiMigrationManager  -  
R15428XWIKI2977 - Add a GUID to existing objects when upgrading from
pre-1.8M1. 
2009-05-06 20:11:50,923 [http://vanille:8080/xwiki/bin/view/Main/WebHome]
[http-8080-Processor25] INFO  .AbstractXWikiMigrationManager  - Running
migration [R15428XWIKI2977] with version [15428] 
2009-05-06 20:11:52,400 [http://vanille:8080/xwiki/bin/view/Main/WebHome]
[http-8080-Processor25] ERROR store.XWikiHibernateBaseStore   - Exeption
while close transaction 
org.hibernate.HibernateException: identifier of an instance of
com.xpn.xwiki.objects.BaseObject was altered from -1950493164 to 1389182009
        at
org.hibernate.event.def.DefaultFlushEntityEventListener.checkId(DefaultFlushEntityEventListener.java:58)
        at
org.hibernate.event.def.DefaultFlushEntityEventListener.getValues(DefaultFlushEntityEventListener.java:164)
        at
org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:120)
        at
org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:196)
        at
org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:76)
        at
org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
        at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
        at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
        at
org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
        at
com.xpn.xwiki.store.XWikiHibernateBaseStore.endTransaction(XWikiHibernateBaseStore.java:852)
        at
com.xpn.xwiki.store.XWikiHibernateBaseStore.endTransaction(XWikiHibernateBaseStore.java:823)
        at
com.xpn.xwiki.store.XWikiHibernateBaseStore.execute(XWikiHibernateBaseStore.java:1043)
        at
com.xpn.xwiki.store.XWikiHibernateBaseStore.executeWrite(XWikiHibernateBaseStore.java:1084)
        at
com.xpn.xwiki.store.migration.hibernate.R15428XWIKI2977Migrator.migrate(R15428XWIKI2977Migrator.java:76)
[...]
*****************

Something seems wrong with migration, but after that wiki starts fairly
right, and is accessible, except for (at least) the import feature ... I
don't know if exception at startup can explain the rest.

-- 
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