Issue #119 - Test HTML4, custom-tags: inline

# About this case

This test case ensures that Tidy handles autonomous custom tags appropriately for pre-HTML5 documents. Tidy will support them via the `custom-tags` option, even though such documents do not support such tags.

In this case, `custom-tags` is inline, and so Tidy should allow them, and treat them as inline. However because this is not an HTML5 document, Tidy will report warnings about their use.

This is a user-defined tag, and Tidy should provide a warning, but allow it. This is a user-defined tag, and Tidy should provide a warning, but allow it. Even though `custom-tags` is inline, this tag is configured as blocklevel in the configuration, and so will be treated as such.

This is an autonomous custom tag,, and it should show up as an inline element, as does this..