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Add read/write capabilities to modbusclient
Removed warning message and changed default unit number to 1
Implement jvazquez-r7 comments
Add ACTIONS descriptions
Use metadata format for actions
Refactor make_payload
Refactor
Add print_status messages
Fix some yarddoc issues
Fix some yarddoc issues
Land #3338, yardoc fixes
Land #3338 for real (see 3542f85)

The other commit ended up having a changed hash. This is a nop for
mostly accounting purposes.
Added Modbus error handling.
It now checks for error and displays the appropriate error message.
The only error simulated was "ILLEGAL ADDRESS", don't know how
to test for others.
Rework banner trailers in sprintf padding
Add new rotating banners for apt installs
Remove dead oldwarn code, fix shortlink
Treat apt and binary installs the same for banners
Fix banner language, padding.
Add module for CVE-2014-0515