Defunct functions in rsnps

• LDSearch(): Function name changed to ld_search

• ld_search(): The Broad Institute took the service down, see https://www.broadinstitute.org/snap/snap

• NCBI_snp_query(): Function name changed to ncbi_snp_query

• NCBI_snp_query2(): Function name changed to ncbi_snp_query

• ncbi_snp_summary(): Function name changed to ncbi_snp_query

• ncbi_snp_query2(): Function name changed to ncbi_snp_query