Replace beowulf core with objects

This is part way to rectifying #192. A manual change to the name of the
core will be needed - reconfigure solr.xml
Remove beoimages

Part way to fixing #192
Replace beocontent

Part way to fix #192
Replace beopublications

Part way towards fix for #192
Replace beobiblio

Part way towards fix for #192
Replace beopeople

Final part this fixes #192
More changes for beowulf core

Definite fix for #192