Memory leaks

[gipert]

Even after #5, there's a small memory leak I cannot fix. Here's the relevant Valgrind output, which seems to blame ROOT (but that's difficult to believe).

$ valgrind --leak-check=full --suppressions=/etc/root/valgrind-root.supp ../bin/gerda-factory phIIAfterLAr-2nbb-all-systematics.json
==707858== Memcheck, a memory error detector
==707858== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==707858== Using Valgrind-3.16.1 and LibVEX; rerun with -h for copyright info
==707858== Command: ../bin/gerda-factory phIIAfterLAr-2nbb-all-systematics.json
==707858==
...
==707858==
==707858== 11,374,736 (95,000 direct, 11,279,736 indirect) bytes in 95 blocks are definitely lost in loss record 10,617 of 10,617
==707858==    at 0x483ADEF: operator new(unsigned long) (vg_replace_malloc.c:342)
==707858==    by 0x4A5600A: TStorage::ObjectAlloc(unsigned long) (in /usr/lib/root/libCore.so)
==707858==    by 0x54C332A: ??? (in /usr/lib/root/libHist.so)
==707858==    by 0x53DAD73: TH1::Clone(char const*) const (in /usr/lib/root/libHist.so)
==707858==    by 0x135780: GerdaFastFactory::AddComponent(TH1 const*, float) (GerdaFastFactory.cc:37)
==707858==    by 0x11614A: main (gerda-factory.cc:307)
==707858==
==707858== LEAK SUMMARY:
==707858==    definitely lost: 95,016 bytes in 96 blocks
==707858==    indirectly lost: 11,279,736 bytes in 366 blocks
==707858==      possibly lost: 21,721,447 bytes in 9,769 blocks
==707858==    still reachable: 2,372,866 bytes in 21,252 blocks
==707858==                       of which reachable via heuristic:
==707858==                         newarray           : 24,952 bytes in 39 blocks
==707858==                         multipleinheritance: 31,072 bytes in 3 blocks
==707858==         suppressed: 84,811 bytes in 828 blocks
==707858== Reachable blocks (those to which a pointer was found) are not shown.
==707858== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==707858==
==707858== For lists of detected and suppressed errors, rerun with: -s
==707858== ERROR SUMMARY: 1036 errors from 1036 contexts (suppressed: 51693 from 274)

I'll leave this here for the record.