Data Cleaner - Identification Difficulty Module
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This module replicates the functionality of the `NBN Record Cleaner 
IdentificationDifficulty rule type 
<http://www.nbn.org.uk/Tools-Resources/Recording-Resources/NBN-Record-Cleaner/Creating-verification-rules.aspx>`_.
This rule type flags species that are not trivial to identify with a rating from 1 to 5
and the rule also identifies the message for each of those ratings. For some taxonomic
groups, for example, a level's might suggest that a specimen is required but this may not
be appropriate for other groups. A single rule can configure the identification difficulty 
for a list of taxa. For correct configuration in the warehouse, create a new
verification rule with the following settings:

* **Title** and **Description** set as required.
* **Test Type** = IdentificationDifficulty
* **Error Message** = ...
* **Other Data** = ::

    [Data]
    list of external keys (e.g. taxon version keys), one per line. Each key is followed by 
    an = then the message ID (a number from one to five)
    [Taxa]
    list of preferred taxon names as an alternative to the Data section. Each key is 
    followed by an = then the message ID (a number from one to five)
    [Ini]
    1=*message for difficulty rating 1*
    2=*message for difficulty rating 2*
    3=*message for difficulty rating 3*
    4=*message for difficulty rating 4*
    5=*message for difficulty rating 5*

So, a rule's Other Data section will contain a Data section and an Ini section, or a Taxa
section and an Ini section, depending on whether the taxa are being listed by external
key or preferred name.