Begin split of classes to individual files
Split SQSolarcell class into its own file
Split DeVosSolarcell class into its own file
Edit uibei into its own file
Individualize import statements
Fix import statement
Fix import statement
Fix import statement

Closes #16.
Bump patch number
Merge code from `ibei` module tag 1.0.3

See previous commit where I merged `ibei` into this repo for more
detailes on the rationale and procedure.