Create Release Notes for 1.0 (#432)

Added initial files and modifications to include 1.0 release notes to
the TOC and variables. Updates:

* updated the ToC names to make them in line with style guide
* updated variable with new release branch and fixed small release note
name
* updated ## Release Highlights with topics:
* Added tickets
* Updated Upgrade considerations

Add missing header include

This was preventing the extension from building on Oracle Linux 8

Stamp 18beta1.

Stamp 17.5.

Stamp 16.9.

Stamp 15.13.

Stamp 14.18.

Stamp 13.21.

Pass proper old rlocator to smgr when creating relations and indexes (#…

…156)

Stamp 17.4.