It doesn't really make sense to encrypt the keys, but store the secret
literally in the same directory. uploadkeys will now be stored in
plaintext. The branch `legacy` has the old code from before this commit.
Since this is default settings and the user might want to customize
them, functions.py has been renamed. This also will prevent conflicts if
the user has updated their functions.py and then tries to pull.
keygen.py now recommends that you run it as the user you want to have
ownership of secret.key and uploadkeys (such as www-data for nginx).
Then, if uploadkeys or secret.key don't exist, they will be created with
the correct ownership.
Since keygen.py is run as root, uploadkeys is owned by root. This causes
issues when imgupload.py tries to chmod the uploadkeys file since it
doesn't have permissions to chmod it.
Solution: remove UPLOADKEYS_CHMOD option
