Simple CRUD with MySQL 2: Output SQL and CRUD forms based on remoteDB class

This class can generate SQL and CRUD forms based on remoteDB class.

It is a class derived from the original work by Mahboobz. This version was improved in the following ways:

Version 4:
Update: replaced irp_commonSQL.php (obsolete) with common_pdo.php

Version 3:
- Added 2 more callback: before_save(), before_updated()
- Tested on Master-detail tables: see example pages
- Tested on view tables.

Version 3: added 2 new hooks, and master->detail capability
added 2 functions: setEdit() and setDelete() to control buttons
Version 2:
- Added $this->index array to store one or more PK names (in place of one pre-defined PK='id')
- Added get_where(), get_hidden($record) to handle multiple PKs
- Added optional hook and callback to customize the CRUD page:
1) special input fields: select, radio... (crud_get_input)
2) special edit fields: select, radio... (crud_get_edit)
3) special show fields: links, references... (crud_get_show)
4) more actions in table (crud_action_hook)
- Added 3 static utility: make_select, make_radio and make_checkbox for input/edit fields
- Added CONFIRM to delete
- Added $extrasql parameter to renderVertically(), to extend the basic sql: "SELECT * FROM ".$this->table
- Cosmetic minor variations, use of css file (in: remoteDB/css/style.css)

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