two tiny patches to eliminate warnings

Hey, anybody still using this, enjoy two patches, first eliminates a recurring php warning in your logs, the second lets you make your SQL installation be configured more safely without throwing errors.

—– in jpconfig.php:
—– in jp_post_advanced(), initialise $error:

function jp_post_advanced() {
  global $wpdb;

  // NEW 2016/07/20 - Creates the variable which is not tested correctly later without init.
  $error='';

—– in jp_functions.php:
—– in jp_format_post(), comment out line 544 (included below), add replacement line:

// $parr = array( 'jpic' => mysql_real_escape_string( htmlentities( $pic, ENT_COMPAT, 'UTF-8' ) ) );
  $parr = array( 'jpic' => $wpdb->escape( htmlentities( $pic, ENT_COMPAT, 'UTF-8' ) ) );

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