one of our apps was stuck in a deadlock in ResourceProperties.size(),
see excerpt of the stack trace below. this fix synchronizes various overriding
methods since they are synchronized in Hashtable as well.
removed superfluous toString method too.
```
"app-230":
at java.util.Hashtable.size(Hashtable.java:206)
- waiting to lock <0xa13f8548> (a helma.util.ResourceProperties)
at helma.util.ResourceProperties.size(ResourceProperties.java:529)
at java.util.Hashtable.equals(Hashtable.java:742)
- locked <0xa1065708> (a helma.util.ResourceProperties)
at helma.objectmodel.db.DbSource.equals(DbSource.java:292)
...
"app-439":
at java.util.Hashtable.size(Hashtable.java:206)
- waiting to lock <0xa1065708> (a helma.util.ResourceProperties)
at helma.util.ResourceProperties.size(ResourceProperties.java:529)
at java.util.Hashtable.equals(Hashtable.java:742)
- locked <0xa13f8548> (a helma.util.ResourceProperties)
at helma.objectmodel.db.DbSource.equals(DbSource.java:292)
...
```
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| .. | ||
| helma | ||
| META-INF/services | ||