TOC macro can generate invalid links when there are included pages

Duplicate header records are not handled correctly when content is pulled into a page with the include or display macros.

Example:

In Page1.WebHome:

Page: Command Name One
= Command Name One
== Usage
== Options
== Command Details
== Troubleshooting

In Page2.WebHome:

Page: Command Name Two
= Command Name Two
== Usage
== Options
== Command Details
== Troubleshooting

Aggregating Page.WebHome:

{{toc/}}

{{include reference="Main.page1.WebHome"/}}

{{include reference="Main.page2.WebHome"/}}

When you include or display them on one page and add a table of contents the macro renders correctly but the links for the duplicate heading level 2 records all link to the first occurrence.