Merge pull request #1 from opitzconsulting/master

test
use xtext boolean ?= operator for column not null
Merge remote-tracking branch 'remotes/upstream/master'

Conflicts:
	orcas_core/build_source/orcas/src/de/opitzconsulting/OrcasDsl.xtext
	orcas_sqlplus_core/sqlplus_api/sql/alter_table_add_column.sql
Merge pull request #10 from llsand/master

use xtetx boolean