update 1
update 07/18
Delete api.php
Delete dogemsg.ui
Delete key.py
Delete postrec.py
add signature to data structure and API
add 'ifread' to API
add 'ifread' to API
Formatting code

Make hex decoding and encoding consistent

Add Authentication: If message, check signature with message; else
check signature with user's public key

Add adduser and modifyuser: API structure slightly modified

Create client.py