Merge pull request #1 from WarrenMoore/master

Added optional data for Q(sqrt(-1))
revised format info concerning base_change and Q_curve
Merge pull request #2 from WarrenMoore/master

Added (1) CM curves and (2) Q-curve flags to IQF data
added a second (base-change) curve to test files
initial Q-curves from Marc Masdeu
Merge branch 'master' of github.com:JohnCremona/ecnf-data
renamed the cm files from Warren