Description of problem:
When creating a book with create_book, the generated Author_Group.xml file contains a <corpauthor> tag, which will break a build.

Version-Release number of selected component (if applicable):
publican-0.36-6.el5

How reproducible:
Every time

Steps to Reproduce:
1. Run create_book
2. Navigate to the Author_Group.xml file
3. See banned tags
  
Actual results:
<authorgroup>
	<corpauthor>FF0000 Headgear Documentation Group</corpauthor>
	<author>
		<firstname>Dude</firstname>
		<surname>McDude</surname>
		<affiliation>
			<orgname>My Org</orgname>
			<orgdiv>Best Div in the place</orgdiv>
		</affiliation>
		<email>dude.mcdude</email>
	</author>
</authorgroup>


Expected results:
<authorgroup>
	<author>
		<firstname>Dude</firstname>
		<surname>McDude</surname>
		<affiliation>
			<orgname>My Org</orgname>
			<orgdiv>Best Div in the place</orgdiv>
		</affiliation>
		<email>dude.mcdude</email>
	</author>
</authorgroup>


Additional info: