fpspreadsheet / spready demo: Formula edit line now shows unformatted number, like Excel and Calc do. A value edited in the formula edit line is now transferred to the worksheet (ignoring formulas so far).

git-svn-id: http://svn.code.sf.net/p/lazarus-ccr/svn@3226 8e941d3f-bd1b-0410-a28a-d453659cc2b4