Error norms#15

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kkhemc wants to merge 6 commits intollnl:masterfrom

kkhemc:error_norms

Commits on May 11, 2019

added error norms for type i, no scattering, problems
kkhemc
committed

Commits on May 13, 2019

added missing ErrorNorms.cpp file to Kernel
kkhemc
committed

Commits on May 24, 2019

fixed a bug in the error normalization in parallel
Kyle K. Chand
committed

Commits on Jun 21, 2019

1) fixed some compiler warnings. 2) added --compute_errors to the usage message. 3) added something about the error code to the README
kkhemc
committed

Commits on Jun 26, 2019