install_schema.sql

1. Fixes #0000218: Error reporting in configuration sections is broken.

2. Implemented fully-featured configuration value validation during saving (just put serialized field option array into "Validation" field in ConfigurationAdmin table for given variable). Even "required" check works. Test on "SessionTimeout" variable.

INP-179

Fixes #0000200: Improvements to Email Events - Functionality and Interfaces

INP-162

1. Fixes #0000189: Changes in Options for "Section Template" field for Sections.

2. Implemented not exactly the way as planned, because administrator can change "Parent Section" from "Content" (top category, where "Inherit from Parent" option in "Template" field not available) to it's child section, where this option should be available. As a result I always show "Inherit from Parent" option, but when administrator manually selects "Inherit from Parent" in "Template" field and "Content" in "Parent Section" field and tries to save changes, I show him an error about that.

INP-152

Releasing version 'branches/5.0.x' (copy from 'branches/RC')