Simplified parsing of reference keys and notes in markdown and RST

readers:
+ The Reference data structure from Text.Pandoc.Shared is no longer
  needed, since
+ referenceKey and noteBlock parses return strings (as many blank lines
  as are occuried by the key or note) and update state themselves.
+ getPosition and setPosition are now used to ensure that error messages
  will give the correct line number.
+ This yields cleaner (and slightly faster) code, with more accurate
  parsing error messages.


git-svn-id: https://pandoc.googlecode.com/svn/trunk@1012 788f1e2b-df1e-0410-8736-df70ead52e1b

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