initialize member variables of posts_to_org_table
initialize member variables of posts_to_org_table

This fixes test/baseline/cmd-org.test when built with clang.

duncanmortimer/ledger,paulbdavis/ledger,duncanmortimer/ledger,jwakely/ledger,afh/ledger,jwakely/ledger,jwakely/ledger,paulbdavis/ledger,paulbdavis/ledger,ledger/ledger,ledger/ledger,duncanmortimer/ledger,afh/ledger,jwakely/ledger,jwakely/ledger,paulbdavis/ledger,duncanmortimer/ledger,paulbdavis/ledger,duncanmortimer/ledger,paulbdavis/ledger,duncanmortimer/ledger,jwakely/ledger,paulbdavis/ledger,jwakely/ledger,ledger/ledger,ledger/ledger,ledger/ledger,afh/ledger,duncanmortimer/ledger,afh/ledger,afh/ledger