Add/update logging

[mobi-nex]

Two kinds of logging update are needed:

1. Remove/Change lot of log levels. For example: many of the logs currently have the error level. When they can be easily relegated to warning or even debug prints. This creates a lot of clutter and useless information on the console. Also, some of the debug prints need to be upgraded to info.
2. There are a lot of places where logging needs improvement or addition at the moment.

This is an excellent first issue as the changes can be easily implemented and they provide a very good opportunity to understand the design and implementation of the project.