TMDM-7702: init impl for removing charts in CE

TMDM-7702: init impl on General side and refine on Welcomeportal

Conflicts:
	org.talend.mdm.webapp.general/src/main/java/org/talend/mdm/webapp/general/client/layout/ActionsPanel.java

TMDM-7702: CE use 2 as DEFAULT_COLUMN_NUM

TMDM-7702: code refine and a bug fix

TMDM-7702: bug fix on Action Panel and code refactoring

TMDM-7702: further bug fix on EE

TMDM-7702: fix bugs on CE

TMDM-7702: bug fix on EE and code clean-ups (Still one more known subtle bug on EE)

Conflicts:
	org.talend.mdm.webapp.general/src/main/java/org/talend/mdm/webapp/general/client/layout/ActionsPanel.java

TMDM-7702: fix bug on EE related unneeded call to get autorefesh config from mdm.conf if db has configs and cleanup

TMDM-7702: cleanup

TMDM-7702: missed clean-up
Merge branch 'maintenance/5.6'