Fix various bugs
- Divide eigenvalues by sqrt(n)
- Output the column mean
- Fix a bug with matrix_scale_and_add
- Fix install-check
Normaize data before doing projection
Support dense matrix in the column format in pca_project
Fixed the PCA eigenvalue calculation to match R, updated the docs to include the column means table, and updated the install check to check both input formats
Refactored input table name casting
Minor changes
Code cleanup