BUGS

* next_runnable_job() ignores dependencies

* command= parsed, but methods.start= used instead

* EnvironmentVariables not actually implemented anymore. They parse, but not inserted into db.

* Lame idiom:
		success = sqlite3_prepare_v2(dbh, sql, -1, &stmt, 0) == SQLITE_OK &&
		sqlite3_bind_int64(stmt, 1, job->row_id) == SQLITE_OK &&
  	    sqlite3_step(stmt) == SQLITE_DONE;

  Replace with:

	if (sqlite3_prepare_v2(dbh, sql, -1, &stmt, 0) != SQLITE_OK ||
		sqlite3_bind_int64(stmt, 1, pid) != SQLITE_OK ||
		sqlite3_bind_int64(stmt, 2, job->row_id) != SQLITE_OK ||
		sqlite3_step(stmt) != SQLITE_DONE)
	{
		db_log_error(sqlite3_finalize(stmt));
		return (-1);
	}