Resolve "FEATURE: Use time stamp from kurisu in update process"

Closes #109 (closed)

• New way of updating the db by re-using fileds when possible
• Check with the repo_timestamp in the repo module instead of getting the file's mtime
• Default the repo_timestamp to the file's mtime at upgrade time

src/database/disk.sql

@@ -22,6 +22,7 @@ PRAGMA foreign_keys        = true;
 --      Make 'misc.version' default to the last version: for now 'mk-7.2'
 -- Version mk-7.3:
 --      Add field 'kara.repo_timestamp'
+--      Make 'misc.version' default to the last version: for now 'mk-7.3'
 
 -- Definition of a kara
 
@@ -159,7 +160,7 @@ CREATE TABLE IF NOT EXISTS updates
 
 CREATE TABLE IF NOT EXISTS misc
   ( id              INTEGER PRIMARY KEY DEFAULT 42 CHECK(id = 42)
-  , version         TEXT    NOT NULL DEFAULT 'mk-7.2'
+  , version         TEXT    NOT NULL DEFAULT 'mk-7.3'
   , last_update     INTEGER
   , last_end_update INTEGER
   , update_job      INTEGER NOT NULL CHECK(update_job >= 0)