Convert image all 5.8

Convert image all v4.8 changes:

Now support hot linked images using Alt text in IMG tag.

Convert image all v4.7 changes:

Fixed issue with dead link causing server error log.

Convert image all v4.6 changes:

Removed function which converted Proxy images.

Convert image all v4.3 changes:

Added Show results to options page.

Convert image all v4.2 changes:

Added "Post ID end" to options page.

Convert image all v4.1 changes:

Fixed exclude domain variable.

Convert image all v4.0 changes:

Options page now has "Exclude domains" which allows more than one domain to exclude.

Convert image all v3.9 changes:

Added troubleshooting options to Options page.

Convert image all v3.8 changes:

Improved corrupt image error handling.

Convert image all v3.7 changes:

Improved corrupt image error handling.