AgePony 3.1.0 makes file size stop mattering.

- Encrypt and decrypt files of any size. Nothing is held in memory, so a 1 GB file works like a small one.
- Encrypting several files now asks: one archive, or one encrypted file each.
- Inspect any age file to see what it is encrypted to, without decrypting it.
- The scrypt work factor is adjustable now, for devices with less memory to spare.
- Rename saved recipients, and save a pasted key with a name.
- Returns to the tab you left on re-lock.
