Merge pull request #819 from gaohoward/master

add documentation in xsd for options mask-password and password-codec.
Add a link to the section about masked-passwords
Merge pull request #820 from FranciscoBorges/master

Add a link to the section about masked-passwords
HORNETQ-804 : drop avoid-large-messages options and make compress-large-messages always send regulars if possible.