Conver tabs to spaces

Signed-off-by: Peter Portante <peter.portante@redhat.com>
Add the ability to only run the indexer.

This commit adds the ability to only run the pycscope indexer on an
existing file list, not running the file list generator before
hand. This allows one to generate the file list, and then actually
edit it so that it can be used as is.

Signed-off-by: Peter Portante <peter.portante@redhat.com>