[postgis-devel] [PostGIS] #1721: Update doc/README

[PostGIS]

#1721: Update doc/README
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 Reporter:  mwtoews        |       Owner:  robe         
     Type:  defect         |      Status:  new          
 Priority:  medium         |   Milestone:  PostGIS 2.0.0
Component:  documentation  |     Version:  trunk        
 Keywords:                 |  
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 Summary of changes included in the patch:
  * reStructuredText Markup, 80 column text limit
  * Structure the make targets using definition lists
  * It turns out that graphviz is required for `make doxygen`

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/1721>
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