added an adcrawler; this already extracts the links of an overview page
and this gets the print ads in their original files sizes
and this extracts img urls and the corresponding tags
cleaned up the usage message
added sqlite db as an ads tag store
added an sql file for the index db
oh well, couch seems to be more able than I realised. so I dropped the sqlite db. this now crawls the ads page and builds a print ad doc store