Schema tweaks for RC

Looking thought the docs, thinking about direct indexing with Tika, etc, I see a couple tweaks we might want to make.

To use the fast vector highlighter, the text fields being highlighted need to have:

termVectors="true" termPositions="true" termOffsets="true"

see: http://wiki.apache.org/solr/SchemaXml#Expert_field_options

The storage of Lucene term vectors can be triggered using the following field options:

termVectors=true|false
termPositions=true|false
termOffsets=true|false
These options can be used to accelerate highlighting and other ancillary functionality, but impose a substantial cost in terms of index size. They are not necessary for typical uses of Solr (phrase queries, etc., do not require these settings to be present).

An important question is the extent to which this increases the index size.