Implementation for: http://issues.roundup-tracker.org/issue2550731 Add mechanism for the detectors to be able to tell the source of the data changes. Support for tx_Source property on database handle. Can be used by detectors to find out the source of a change in an auditor to block changes arriving by unauthenticated mechanisms (e.g. plain email where headers can be faked). The property db.tx_Source has the following values: * None - Default value set to None. May be valid if it's a script that is created by the user. Otherwise it's an error and indicates that some code path is not properly setting the tx_Source property. * "cli" - this string value is set when using roundup-admin and supplied scripts. * "web" - this string value is set when using any web based technique: html interface, xmlrpc .... * "email" - this string value is set when using an unauthenticated email based technique. * "email-sig-openpgp" - this string value is set when email with a valid pgp signature is used. (*NOTE* the testing for this mode is incomplete. If you have a pgp infrastructure you should test and verify that this is properly set.) This also includes some (possibly incomplete) tests cases for the modes above and an example of using ts_Source in the customization.txt document.

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Roundup Glossary
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class
   a definition of the properties and behaviour of a set of items
db (or hyperdb)
   a collection of items
designator
   a combined class + itemid reference to any item in the hyperdb
itemid
   a numeric reference to a particular item of one class
item
   a collection of data that forms one entry in the hyperdb.
property
   one element of data that makes up an item. In Roundup, the set 
   of item properties may be changed as needed - even after the 
   tracker has been initialised and used in production.
schema
   the definition of all the classes that make up an tracker
tracker
   the schema and hyperdb that forms one issue tracker
tracker home
   the physical location on disk of a tracker


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