Model combined.R does not sync some inputs

[matt-har-vey]

Running combined.R from a state where no Drive files have been synced fails on PC_delinted.csv being not found.

• Copy authoritative versions of point_counts/data_ingest/output to Drive
• Modify combined.R to add a drive_sync of point_counts/data_ingest/output/PC_delinted.csv

[matt-har-vey]

Assigning this to Mary, since she "owns" the point count data, for the first bullet:

• Copy authoritative versions of point_counts/data_ingest/output to Drive.

(even Resilience_Data_Drive/COMB/point_counts does not exist yet)

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The second bullet point is obsolete, since we decided to remove the drive_sync() from combined.R in favor of symlinks until we move to a project-wide convention (possible design criteria: minimize hard-coding of paths in source files, minimize huge downloads by individuals working on a chunk that does not require them).