feedbrowser_cache: store title; implement by-title search in feed browser

schema/ttrss_schema_mysql.sql

@@ -224,7 +224,7 @@ create table ttrss_tags (id integer primary key auto_increment,
 
 create table ttrss_version (schema_version int not null) TYPE=InnoDB;
 
-insert into ttrss_version values (51);
+insert into ttrss_version values (52);
 
 create table ttrss_enclosures (id serial not null primary key,
 	content_url text not null,
@@ -379,6 +379,7 @@ create table ttrss_sessions (id varchar(250) unique not null primary key,
 
 create table ttrss_feedbrowser_cache (
 	feed_url text not null,
+	title text not null,
 	subscribers integer not null);	
 
 create table ttrss_labels2 (id integer not null primary key auto_increment,