[AndyB] First post 1.2

Requires first post to be an introduction thread.

Features:

• All phrases start with firstpost_ for your convenience.

Installation:

1. Download Andy-FirstPost-1.0.zip and unzip it.
2. Copy the src/addons/Andy/FirstPost directory to your server.
3. From the Admin Control Panel Install the add-on.

Error message is displayed when:

1. Replying to an existing thread.
2. Creating a new thread in other than the Introduction forum.