Feaure/dont use ug symlinks

The hack to have every sub-directory in the include path does no longer work for me. Time to get it fixed by making the include paths relative to dune-uggrid root directory.

• include paths relative to dune-uggrid root directory
• move header files below dune/uggrid/.
• drop folder ug/ and compatibility with UG 3.13.

Supersedes !137 (closed) Fixes #13 (closed)

cmake/modules/DuneUggridMacros.cmake

@@ -5,7 +5,7 @@ set(UG_VERSION "${DUNE_UGGRID_VERSION}")
 # The dune module is alway 3.13.0 or above!
 add_definitions(-DUG_USE_NEW_DIMENSION_DEFINES)
 
-if(UG_PARALLEL STREQUAL "yes")
+if(UG_PARALLEL)
   # Actually we probably should activate UG
   # for everything. But for the time being we fall
   # back to the enable trick. To change this just
@@ -24,17 +24,3 @@ endif()
 
 include(CheckIncludeFile)
 check_include_file ("rpc/rpc.h" HAVE_RPC_RPC_H)
-
-# Check whether dune-uggrid is installed
-# to work around includes not relative to dune-uggrid's root directory
-if((NOT dune-uggrid_INSTALLED) AND (NOT PROJECT_NAME STREQUAL dune-uggrid))
-  include_directories(${dune-uggrid_PREFIX} ${dune-uggrid_PREFIX}/low
-    ${dune-uggrid_PREFIX}/gm ${dune-uggrid_PREFIX}/dom
-    ${dune-uggrid_PREFIX}/np ${dune-uggrid_PREFIX}/ui
-    ${dune-uggrid_PREFIX}/np/algebra
-    ${dune-uggrid_PREFIX}/np/udm
-    ${dune-uggrid_PREFIX}/parallel ${dune-uggrid_PREFIX}/parallel/ddd
-    ${dune-uggrid_PREFIX}/parallel/ppif
-    ${dune-uggrid_PREFIX}/parallel/dddif
-    ${dune-uggrid_PREFIX}/parallel/ddd/include )
-endif()