Calculates the CoC population and share of the CoC coming from each tract. Both for the total population and the population under the poverty line.
build_tract_crosswalk(recombined_tracts)| recombined_tracts | A data frame of tracts, their populations, and the corresponding CoC | 
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A data frame:
tract_fips: Census Tract FIPS code
coc_number: CoC number
coc_name: CoC name
year: Year
tract_pop: Census Tract population
tract_poverty_pop: Census Tract population below poverty line
tract_renting_hh: Number of renter households in the Census Tract
coc_pop: CoC population
coc_poverty_pop: CoC population below poverty line
coc_renting_hh: Number of renter households in the CoC
pct_coc_pop_from_tract: Share of the CoC population from the Census Tract
pct_coc_renting_hh_from_tract: Share of the CoC renter households from the Census Tract