v1.4.0 CRAN release - Multi-Structure and Superposition

• Added addStructure and setSuperpose functions to load and overlap multiple structures in the same stage.
• Updated internal logic with R 4.3.0's stricter && and || evaluations to prevent errors with multi-element vectors.

CRAN release

v1.3.1

add return values

Pre CRAN release

v1.3.0

eradme update