Task:Init(Name,R,C,Rs,Cs,Clr,Shadow): return true
  Preparing job is done here by initialising the window, adding the new task
  to the stack (for the task swapper), the hot keys are set. The new task
  window remains unvisible after finishing of Task:Init.

  Parameter description:
  ~~~~~~~~~~~~~~~~~~~~~~
  Name: text alebo kodovy blok: default is {||""}, i.e. no title.
   Text or code block as window title.

  R: numeric: default is 3.
   Upper window border.

  C: numeric: default is 4.
   Left window border.

  Rs: numeric: default is MaxRow()-7.
   Window height in number of rows passed into.

  Cs: numeric: default is MaxCol()-9.
   Window widthin number of columns passed into.

  Clr: character: default is m->Color:Edit.
   Window color.

  Shadow: logical: default is true for color monitor, false for monochrom.
   If true, the shadow will be painted.