Changes for 0.06    Thu Feb 19 15:14:48 2004
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* add template option 'defined'

Changes for 0.05    Tue Feb 10 18:18:23 2004
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* allow nested lists in allow()

Changes for 0.04    Thu Sep 18 13:41:48 2003
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* Use carp to get a better caller perspective
* add the last_error() routine
* add the allow() routine


Changes for 0.03    Wed May 14 14:33:17 2003
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* Verbosity's default setting depends on $^W
* New global flag to not change the casing of keys