public static boolean closePdb(GhidraScript script, String filename) {
		boolean success = closePdbInternal(script, filename);
		if (success) {
			pdbInfoByFile.remove(filename);
		}
		return success;
	}
Closes and unloads the PDB file from the map.  Not removed from map if IOException.
@param script script for which we are working
@param filename filename of the PDB file
@return true if successfully closed and removed from the map; false if not found in the map
or if problem closing the PDB.
Ghidra/Features/PDB/developer_scripts/pdbquery/PdbFactory.java