search works on subterms
add search_lexemes table
add Search::Similarity class
align db_structure.sql
add search_for_similar to Search
make SearchController use new Search structure
use new search in search page
simplify HTML structure and use strong, not bold
add "Handle misspellings" section in search docs
Merge branch 'master' into handle-search-misspellings

Conflicts:
	db/structure.sql
Merge pull request #59 from unepwcmc/handle-search-misspellings

Handle search misspellings