scratch added
a bit refactoring for open formula UI ++ some bugfixes
some notes to eliminate random test fails added (for future developers)
some notes about deprecation added
removed unnecessary boolean value
Merge branch 'master' into pru/257

Conflicts:
	libraries/libformula-ui/source/org/pentaho/openformula/ui/DefaultFunctionParameterEditor.java
	libraries/libformula-ui/source/org/pentaho/openformula/ui/MultiplexFunctionParameterEditor.java
	libraries/libformula-ui/test/org/pentaho/openformula/ui/FormulaEditorPanelTest.java
PRD-4713; PRD-4739 - (Pull-257) Formula UI fixes for empty fields and parameter count on functions.