quark hashtable locking

[Alexander Larsson <alexl redhat com>]

Why does gdataset.c use a mutex to protect the quark hashtable. Isn't
this the ideal place for a readers-writers lock (GStaticRWLock). This
might not be a heavily contended lock, but it seems like a simple change
too. Maybe i'm missing something?

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 Alexander Larsson                                            Red Hat, Inc 
                   alexl redhat com    alla lysator liu se 
He's a time-tossed skateboarding matador with a secret. She's a 
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