Version v.5.1b
- "Bug" fixed: serial additions to (& substractions from) memory
  now easier

Version v.5.1a
- thousands separators now used
- a pause has been introduced before auto-paste at foreground,
  to allow the exiting application to fill the clipboard
- bug fixed: decimal separator was not accepted in serial
  calculations (!)

Version v.5.1
- added Copy/Paste (Ctrl+C / Ctrl+V) functionality, with the options
  to auto-Copy when MiniCalc is sent to the background and to
  auto-Paste when MiniCalc is called to the foreground.