Squashing some bugs in predict_rasterEngine (not done yet)

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/spatial-tools@150 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Should now build.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/spatial-tools@151 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Added clearworkers=TRUE default, to force the clearing of rasterEngine/focal_hpc's workers' memory.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/spatial-tools@152 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Fixed a serious bug with clearing all local memory (if doSEQ is registered).  Also added (finally) the ability to set the datatype output.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/spatial-tools@153 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Fixed datatype bug in rasterEngine (thanks Nathan!)

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/spatial-tools@154 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Version being submitted to CRAN.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/spatial-tools@155 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
sfQuickStop now behaves better when cluster fails with "Error in summary.connection(connection) : invalid connection"

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/spatial-tools@156 edb9625f-4e0d-4859-8d74-9fd3b1da38cb