New implementation of indexes: now it uses only two tables (index for all

New implementation of indexes: now it uses only two tables (index for all
data and tags for all tags). Currently, it doesn't enforce relation between
them on RDBMS level (I have to test this code against SQLite and MySQL
before enforcing that).
Removed swish-e output while indexing, database is used as default tag to
enable filtering by database (there isn't possiblity to set tag to something
else yet!). Output usage count in index.

git-svn-id: file:///home/dpavlin/private/svn/webpac/trunk@641 13eb9ef6-21d5-0310-b721-a9d68796d827