MEFA4 VERSIONS

Version 0.2-1 -- February 14, 2011
    * Melt function added to reverse side effects of Xtab.
    * Docs for Melt added (Rd, tests, vignette).

Version 0.2-0 -- February 7, 2011
    * First public CRAN release.

Version 0.1-2 -- January 26, 2011
    * nonDuplicated function added.
    * segmented Xtab output implemnted
      as list of sparse matrices.

Version 0.1-1 -- January 25, 2011
    * S4 classes working properly.
    * /tests dir added to pkg tree.
    * Xtab class is redundant, 
      use dgCMatrix class instead.
    * A vignette with design decisions
      added, it also has the performance
      comparison.
    * mbind method for binding matrices
      added with a 'left join' implementation.
    * Rd files added, needs proofreading.

Version 0.1-0 -- January 20, 2011
    * Start development for S4 classes.
