[Management] Global code review

Tasks for all code files:

• Review
• Code clean-up (de-clutter, coding rules, tests)
• Complete documentation

Further management tasks:

• conda environment check, library versions
• tests, CI, PR to develop branch, ...

Library python files (125,000 lines)

• basic.py
• calibration.py
• cat.py
• correlation.py
• cosmology.py
• galaxy.py
• io.py
• plots.py
• plot_style.py
• survey.py
• util.py

Stand-alone scripts (60,000 lines)

• check_tile_IDs_SP_LF.py
• combine_results.py
• compute_area.py
• create_joint_shape_cat.py
• leakage.py
• plot_gal_random.py
• plot_rand.py
• stats_tile_id_gal_counts.py
• survey_stats_all.sh

Notebooks (400,000 lines, 170, 000 without validation_local.ipynb, correlation.ipynb)

• correlation.ipynb
• cosmology.ipynb
• frac_error_local_calib.ipynb
• main_set_up.ipynb
• maps.ipynb
• maps_local.ipynb
• match_stats.ipynb
• metacal_global.ipynb
• metacal_local.ipynb
• psf_leakage.ipynb
• TD_WL_cycle2_2021.ipynb
• validation_local_cal.ipynb
• write_cat.ipynb