LeftOwners and RightOwners can now be used as either disjoint
or overlapping sets of users for encrypting a message. Default
behavior is to set them to Owners given a non-empty Owners set.
One member from each group are required to decrypt the message.
There are a few changes made here:
* Comments have been updated to reflect the presence of ECC records.
* Variables named rsa* have been renamed pub* to reflect the general
use of public key cryptography, instead of RSA specifically.
* An if statement for RSA keys now handles both RSA and ECC keys.
The passvault's id is created with math.rand as a native int.
If the vault is created on a 64-bit system, it breaks compatibility
with 32-bit systems.
- Generate vaults with 32-bit ids.
- Update testcode
