Suggested init changes

[nsheff]

1. Make it so we don't have to init everything.

Right now, if something in the constructor doesn't init (like the b2bsi object, say), then the whole thing will crash.
Instead, the object should fail gracefully; it should init all the things it can init, and then just not provide the functions that it cannot do.

2. Use side effects for init functions

BedBaseConfig._init* functions are returning the thing they init. Instead, as methods, they should just init the thing as a side effect.
The reason is that then a user can more easily call

A user may want to init something after the object is created. Right now, the _init functions are private, and they don't actually init the thing they just return the value. So a user can't really init things on their own.

Instead, these should use side effects to attach the initialized objects, and allows users to not initialize everything at the constructor step, instead allowing the user more modularity.

This would simplify the code and be more flexible, without changing the default use mode.