Highlight UnMatched Brackets

Capture those unmatched brackets while u r still in insert-mode

• Script id: 350
• Author: Naveen Chandra
• Latest version: 2.0
• Release date: 2002-10-15
• Release notes:
  - Added support for defining additional bracket
  pairs through matchpairs.
  - Elliminated those irksome errorbells by silent!
  - Added support for highlighting brackets within the
  displayed lines i.e. highlighting the brackets is
  done only in the currently displayed lines
  eventhough the matching bracket is outside the
  currently displayed lines.
  - Elliminated those visual jerks or shifting of
  editing line.