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move `COMPARE_RECORD` into UGDIM namespace

Ansgar Burchardt requested to merge ansgar/dune-uggrid:cleanup/move-COMPARE_RECORD-into-UGDIM-namespace into master

This silences a compiler warning from GCC when building programs with LTO where GCC sees two definitions of COMPARE_RECORD (for 2d and for 3d):

../gm/refine.cc:3450:8: warning: type ‘struct compare_record’ violates the C++ One Definition Rule [-Wodr]
../gm/refine.cc:3450:8: note: a different type is defined in another translation unit
../gm/refine.cc:3453:12: note: the first difference of corresponding definitions is field ‘elem’
../gm/refine.cc:3453:12: note: a field of same name but different type is defined in another translation unit
../ug/gm.h:1644:24: note: type ‘union ELEMENT’ should match type ‘union ELEMENT’

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