Relocate source into a pyrpca or pylar package

To ensure there are no conflict with existing toolkits, import of the objects should be done using:

```
import pyrpca.core.ialm as ialm
import pyrpca.core.ealm as ealm
```

instead of

```
import core.ialm as ialm
import core.ealm as ealm
```

Start by inspecting the repository's current core source layout and the import paths shown in the issue. Relocate the source under a pyrpca or pylar package and update imports so pyrpca.core.ialm and pyrpca.core.ealm work without conflicts.

Written by the indexing model from the issue text.