Merge pull request #192 from tdt/development

Version 4.1.0
Merge pull request #214 from tdt/development

Version 4.2.0
Merge pull request #228 from tdt/development

Version 4.3.0
Merge pull request #249 from tdt/development

Version 4.6.0
fixed 'column id does not exist' during installation on server with PostgreSQL
fixed 'null value in column draft violates not-null constraint' on server with PostgreSQL
Small fix on the XML formatter
Merge branch 'pgsql-fixes' of https://github.com/hanecak/core into development