Removed .o and .rc files.
Created vignettes directory and moved out of inst/doc.
Some fixes for R CMD check.
Updated NEWS file to 1.6.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/gradientforest@25 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Delete extraneous files.
Created vignettes directory and moved out of inst/doc.
Some fixes for R CMD check.
Added CITATION file.
Improve formatting and content of help files.
Reduced size of some data files.
Move lattice from Depends to Imports.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/gradientforest@26 edb9625f-4e0d-4859-8d74-9fd3b1da38cb