Harmonized behaviour when point length is invalid.
Fixed some typographic errors in comments.
Activated Curve25519 support for ECDHE cipher suites.
More optimisations for EC P-256 "i15" (specialised squaring function, mixed coordinates addition with a 4-bit window when the base point is the conventional generator).
New "i15" implementation of big integers (faster, and constant-time, on ARM Cortex M0/M0+); imported into EC, ECDSA, RSA.
Initial import.