"Find and Replace" Feature

Browse a table, check a row and click on change button at the bottom of the table. "Find and Replace" form is there.


> Changes:
- Added a form for the input from user at the bottom of tbl_change.php file.
- Added a new file "tbl_find_replace.php" to be used as the action of the form.

> Not implemented:
- User confirmation before executing the form.


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