Increase groupr.f90's maxr1 and maxr2

maxr1 is the maximum number of MTs that appear. It was set to 1000 as only 1000 MT numbers can currently exist.
    
maxr2 is the maximum number of subsections of MF=6, 9, and 10 combined. As only MF=5 and MF=18 should need substantial space, maxr2 was increased to 2 * (maximum expected nuclides).

src/groupr.f90

@@ -42,8 +42,8 @@ module groupm
    ! - lfs8(i) points to the "level number" from mf8.
    ! - mlfs8(i) is calculated and corresponds to NJOY's assumption
    !   of the ground state or isomer number.
-   integer,parameter::maxr1=500
-   integer,parameter::maxr2=500
+   integer,parameter::maxr1=1000
+   integer,parameter::maxr2=10000
    integer::mf4(maxr1),mf6(maxr1),mf12(maxr1),mf13(maxr1),mf18(maxr1),&
      mf4r(6,maxr1),mf6p(6,maxr1),mf10f(maxr2),mf10s(maxr2),mf10i(maxr2),&
      lfs8(maxr2),mlfs8(maxr2)