[Pig Wiki] Update of "Pig070IncompatibleChanges" by PradeepKamath

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The "Pig070IncompatibleChanges" page has been changed by PradeepKamath.
http://wiki.apache.org/pig/Pig070IncompatibleChanges?action=diff&rev1=30&rev2=31

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  == Summary ==
  
  || Change || Section || Impact || Steps to address || Comments ||
- || Load/Store interface changes || Changes to the Load and Store Functions || High || [[LoadStoreMigrationGuide || Load Store Migration Guide]] || ||
+ || Load/Store interface changes || Changes to the Load and Store Functions || High || [[LoadStoreMigrationGuide || Load Store Migration Guide]] [[Pig070LoadStoreHowTo || Pig 0.7.0 Load Store Guide]]|| ||
  || Data compression becomes load/store function specific || Handling Compressed Data || Unknown but hopefully low || If compression is needed, the underlying Input/Output format would need to support it || ||
  || Bzip compressed files in PigStorage format can no longer have .bz extension  || Handling Compressed Data || Low || 1. Rename existing .bz files to .bz2 files. 2. Update scripts to read/write files with bz2 extension || This change is due to the fact that Text{Input/Output}Format only supports bz2 extension ||
  || Switching to Hadoop's local mode || Local Mode || Low || None || Main change is 10-20x performance slowdown. Also, local mode now uses the same UDF interfaces to execute UDFs as the MR mode. ||