ecgen v0.8.8: More CM fixes

ecgen v0.8.1: Fixed CM composite order generation

ecgen v0.8.0: Generating smooth-order curves and curve families (BN/B…

…LS/...)

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