Compatibility and Bug fixes for latest version of Magento 1.8+

Fixes:

- table prefixes used properly on old OSC tables
- Larger chunk of data at a time 10 to 500
- Better conversion of existing data to Magento 
- GET Param for Website ID fixed
  - Remove creation of Website and Store View to prevent duplication on multiple runs

Other:

- Add comments to Run.php that can be used to speed up processing and allow for multiple Http requests to speed up import times.  However invalidates UI updates on state of Import. Use with caution.

Changes used with Enterprise 1.14.x