Introduce a "src" folder to follow standard project layout

[astares]

There are many packages for Iceberg and they are all visible as directories directly in the root folder of the project. Also it is hard to spot the "docs" folder with the current layout.

It would be better if the Iceberg repository would follow the standardized layout to have a src folder

• "root" -- "docs" -- "scripts" -- "src" --- Iceberg --- Iceberg-Memory --- ....

This can be easily done in a few minutes by

1. create a directory "src" in the project
2. moving the BaselineOfIceberg and Iceberg-xxx packages into it
3. moving the .properties into the "src" folder too
4. changing the .project file to look like

{
	'srcDirectory' : 'src'
}