util.sasl.scram: Optimized binaryXOR.

util.sasl.scram: Fixed a variable redeclaration.

modulemanager: Fire events module-loaded and module-unloaded, both receive a table with 'module' and 'host' fields, thanks bjc

util.sasl.scram: Making =2D and =3D substitution actually work.

util.stanza: Add stanza:get_child(name, xmlns) to find a child tag given a name/xmlns

util.sasl.plain: A little refactoring.

Merge with 0.6.

core.xmlhandlers: Fixed processing of empty namespaces (which caused an issue with jwchat).

mod_register: Properly notify contacts of subscription removal on account deletion.

mod_presence: Use the local host object as the origin for auto-generated subscription approvals and cancellations.

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