(math/R-geoR) Updated from 1.7.5.2.1 to 1.8.1

(from inst/doc/CHANGES)
                =====================================
        CHANGES IN geoR VERSION 1.8-1
        =====================================
Changes

      o Removed the example in subarea() using geoRglm:::rongelap
      ultil the package gets back to CRAN

      o added reference to Diggle & Ribeiro (2007) on the description
      file

Fixes
      o no longer using attach() to address NOTE in CRAN checks
        (it mostly affects image() persp() and countour() functions)

      o no longer writing/assigning objects to the global environment
      to address NOTE in CRAN checks

      o Brain's changes in C code to address valgrind issues

                =====================================
        CHANGES IN geoR VERSION 1.7-5
        =====================================
BUGS/Fixes
      o call to sp::overlay changed to sp::over()

      o changes to fix issues on CRAN reported errors/warnings
regarding namespaces and foreign calls

(mef)