Resolves #7. Added edit data functionality.

Modified files are 
editdata.php
updaterow.php
show.php
Accept and merge.

DB Structure update. Please update your master_data table by using following SQL statements.

```
-- phpMyAdmin SQL Dump
-- version 3.5.2.2
-- http://www.phpmyadmin.net
--
-- Host: localhost
-- Generation Time: Aug 09, 2013 at 01:00 PM
-- Server version: 5.5.27
-- PHP Version: 5.4.7

SET SQL_MODE="NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";

--
-- Database: `my_db`
--

-- --------------------------------------------------------

--
-- Table structure for table `master_data`
--

CREATE TABLE IF NOT EXISTS `master_data` (
  `dataid` int(11) NOT NULL AUTO_INCREMENT,
  `uid` int(10) NOT NULL,
  `Party_Name` varchar(255) DEFAULT NULL,
  `Description` varchar(255) DEFAULT NULL,
  `Liability_Year` int(11) DEFAULT NULL,
  `Forum` varchar(255) DEFAULT NULL,
  `Amount_Pending` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`dataid`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=4 ;

--
-- Dumping data for table `master_data`
--

INSERT INTO `master_data` (`dataid`, `uid`, `Party_Name`, `Description`, `Liability_Year`, `Forum`, `Amount_Pending`) VALUES
(1, 2, 'testpartylolololololol', 'woooaaah it works', 20121, 'chennaiqwq', '1000000000'),
(2, 2, 'test3', 'testdesc 3', 2012, 'delhi', '2000000'),
(3, 2, 'test2', 'testdesc 2', 2012, 'delhi', '2000000');

```