Finite Field support #472

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	8m 9s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	8m 42s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	3m 51s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	4m 14s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	5m 19s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	5m 40s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 49s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	3m 0s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	7m 58s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	8m 12s
	57m 54s

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