Add basic tests for logical_line and line values
Fix Col/Line being backwards

  POS = [
    Line Number,
    Column Number,
    Visual Column Number,
    Logical Line Number,
    Logical Filename
  ]
Add a test for the value of ->source

Show that it's the problem line instead of the top of the document
ProhibitLongLines: Store offending line for later display purposes

Closes #1
Hide VirtualPos from things that index it
v0.009

        - fix reported line number in ProhibitLongLines
          (thanks Kent Frederic and Oliver Trosien)