Rename some things

• Rename effect_tox_observed_averaged and effect_tox_env_observed_averaged. Maybe "smoothed" instead of "averaged"?
• Rename all variables calles sys_stress_* because the "stress" is redundant and thus confusing.
• Attach "before_fit" to the names output$sys_stress_tox and output$sys_stress_tox_env. Also include a fitted version in output.
• In ec() rename target_effect to response_level making it similar to drc::ED().
• The names of the objects in the ecxsys output including the column names in output$curves are messy. Make them easier to understand and less similar to each other, if possible.
• I may want to be able to plot other stresses, not only sys. Therefore I should rename the function plot_system_stress to plot_stress.
• "simple" -> "LL5"
• effect_tox_simple -> effect_tox_LL5, effect_tox_mod_simple -> effect_tox_LL5_mod, and same with env.
• Updated documentation.
• Updated tests.

changed milestone to %v2.0

added in progress refactoring labels

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changed title from Rename some variables to Rename some things

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mentioned in merge request !3 (merged)

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marked the checklist item In ec() rename target_effect to response_level making it similar to drc::ED(). as completed

marked the checklist item "simple" -> "LL5" as completed

marked the checklist item effect_tox_simple -> effect_tox_LL5, effect_tox_mod_simple -> effect_tox_LL5_mod, and same with env. as completed

marked the checklist item Rename all variables calles sys_stress_* because the "stress" is redundant and thus confusing. as completed

marked the checklist item I may want to be able to plot other stresses, not only sys. Therefore I should rename the function plot_system_stress to plot_stress. as completed

marked the checklist item Attach "before_fit" to the names output$sys_stress_tox and output$sys_stress_tox_env. Also include a fitted version in output. as completed

marked the checklist item The names of the objects in the ecxsys output including the column names in output$curves are messy. Make them easier to understand and less similar to each other, if possible. as completed

marked the checklist item Updated documentation. as completed

marked the checklist item Updated tests. as completed