Allow umfpack to be used as an alias for SuiteSparse

Most people will associate the use of SuiteSparse with "using UMFPACK"
since that is the component that is actively used.

configure

@@ -24,6 +24,7 @@ Optional Packages:
                           Algebraic Multigrid solver from specified source
                           location. Note: this option requires a complete,
                           working Fortran 90 environment.
+  --with-umfpack=PATH     use UMFPACK/SuiteSparse from a specified location
   --with-ert=PATH         Use ERT libraries
 
 Some influential environment variables:
@@ -88,6 +89,12 @@ while getopts -- ":-:" optchar; do
           # expand to full path since CMake changes to source directory (!)
           # this also normalize the path name wrt. not having a trailing slash
           pkgloc=$(sh -c "cd \"${pkgloc}\"; pwd")
+          # special aliases
+          case "${pkgname}" in
+            umfpack)
+              pkgname="SuiteSparse"
+              ;;
+          esac
           # packages need different suffix for their root (sic)
           case "${pkgname}" in
             agmg  |\
@@ -97,7 +104,8 @@ while getopts -- ":-:" optchar; do
               rootvar="${pkgname^^}_ROOT"
               ;;
             dune-common |\
-            dune-istl)
+            dune-istl   |\
+            SuiteSparse)
               rootvar="${pkgname}_ROOT"
               ;;
             superlu)
@@ -113,6 +121,12 @@ while getopts -- ":-:" optchar; do
         disable-*)
           # get the name of the package
           pkgname=${OPTARG#disable-}
+          # special aliases
+          case "${pkgname}" in
+            umfpack)
+              pkgname="SuiteSparse"
+              ;;
+          esac
           # casing is of course different
           case "${pkgname}" in
             debug)