Added optional data for Q(sqrt(-3))
Fixed small issue with script

In the event that there are two isogenous curves E and E’, both within
the inputted list of curves, but E’ cannot be found by the
isogeny_class(E) function, the script will output details for E’ twice:
in practice, this shouldn’t happen often, but this commit fixed that
issue.
Added optional data for Q(sqrt(-7))
Merge remote-tracking branch 'upstream/master'
Fixed labels, Q-curve flag and isogeny classes
Merge branch 'master' of https://github.com/JohnCremona/ecnf-data
Merge remote-tracking branch 'upstream/master'
Added script for producing curve_data.* files

This script reads in the curves.* files produced for QUADRATIC fields
and outputs a list of additional data where possible.
Fixed bug in warren-script.sage
Merge pull request #6 from WarrenMoore/master

Added script for producing curve_data.* files