[backported] Fixes INP-1723 - Asynchronous e-mail sending by default
Fixes INP-1557 - Use "http_build_query" to escape url parameters
Fixes #0001424: Inconsistent naming in "E-mail Templates" section
Bug #0001025: Automatically set "svn:keywords" property to PHP files
Releasing version 'branches/5.2.x' (copy from 'branches/5.1.x') of 'in-portal' module.
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