Report polypharmacy in results and standardize annotation

[lamurian]

• In the descriptive results, we need to categorize the type of polypharmacy
• Move the daily-variation figure to the supplementary file
• Make the scientific annotation more consistent, e.g. when reporting the eigenvector centrality we can limit to two digits after decimal mark and use x 10^{-n}$

[lamurian]

• [x] Same-class polypharmacy is the use of multiple medications from the same class
• [x] Multi-class polypharmacy is the use of multiple medications from different classes indicated for the same symptom cluster
• [ ] Adjunctive polypharmacy is the use of additional medications to treat side effects due to other medications
• [ ] Augmentation polypharmacy is the use of full-dose and sub-dose medications from a different class for the same symptom cluster
• [x] Total polypharmacy is the total count of all medications used by a patient, both psychopharmaca and other classes alike

[lamurian]

Add the following to the summary statistics of polypharmacy: mean, median, IQR, SD.