ecgen v0.7.7: Fix build with PARI 2.15.0

ecgen v0.7.6: Support for macOS

ecgen v0.7.5: Fix CM discriminant and conductor computation

ecgen v0.7.4: Fix build with PARI 2.13.0, other fixes

ecgen v0.7.3: cleanup of CM method, fixes

ecgen v0.7.2: metadata computation, supersingular curve generation

ecgen v0.7.1: minor CM fixes

ecgen v0.7.0: Complex multiplication and P1363 CM algo

ecgen v0.6.5: Koblitz curve and Twist order computation

ecgen v0.6.4: Twists