Win32::Mechanize::NotepadPlusPlus v0.006

• add getSettingsOnCloudPath() with test (#54)
• add getLineNumberWidthMode(), setLineNumberWidthMode(), and
  the %LINENUMWIDTH enumeration with test (#54 addendeum)
• test suite bug: with v7.9.1 and newer, replaceTargetText() changes
  the selection/getTargetText() value, so update the readback
  to be version agnostic (#57)
• documentation error: fox %NPPIDM description in Notepad.pm (#53)
• meta fix: make test suite pass on cpantesters smoke testers,
  even if smoke tester machine doesn't have Notepad++, or has
  an old, incompatible version (#56)