BISG implementation in eiCompare#126

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pssachdeva wants to merge 5 commits intomasterfrom

Commits on Oct 31, 2020

initial commit of utility functions for performing BISG within eiCompare
pssachdeva
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Commits on Nov 1, 2020

added functionality to look at bigger geographic region when no matches happen - need to deal with fips codes
pssachdeva
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Commits on Nov 2, 2020

Fixed the merging with different levels of fips codes in compute_p_r_cond_s_g
pssachdeva
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Commits on Nov 21, 2020

initial passes at some functions for errors
pssachdeva
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Commits on Dec 13, 2020

adding some in progress error prop util tests, fixing description for warnings
pssachdeva
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