they are now shown only when a new board is loaded, if there are warnings.

   File "rules" has instructional text as comments near top.

2) Convert all text files in repo to LF line ending form.
   Any checkout done with "rules" in play will convert the working
   tree to native line ending, while keeping repo as LF line ending.

Pcbnew: fix bug in drag module: connected tracks were not dragged.
worksheet: code cleaning.