proEQUIB.0.3.0

• Create object-oriented programming (OOP) units.
• Create RL emissivity functions and other updates in other routines.
• Update examples.
• Update API Documentation.

proEQUIB.0.1.0

• A bug in atomic level assumption fixed.
• Some revisions in calc_populations().
• A new function calc_crit_density() included.
• A new function get_omij_temp() included.
• A new function print_ionic included.
• Optional density range and temperature range added to plasma diagnostics.

proEQUIB.0.0.6

Update paper.md

Changed to the APA citation style.