changes to dbfrontend 0.0.5.16

BUGFIX: Hidden projects on the main listbox component. 
The listbox had slipped under the tmainmenu component.

* ability to read new component "spin" from the cfg file 
  3rd item on the row is the optional increment setting 
  which is 1 if   omitted.

* ability to read new component "quoted_dir" from the cfg file
  this quotes a dir path and ends it with a backslash

* reading # comments as hints for the tabsheet components
  ( ; comments are ignored )

* introduced tjvballoonhint for the hints

* New checkbox to switch hints off/on in config

* history has moved into its own window

* new menu item "history" in the "View" menu

