Reset database.

* src/sql/upgrade-2.sql: Remove it.
* src/sql/upgrade-3.sql: Remove it.
* src/sql/upgrade-4.sql: Remove it.
* src/sql/upgrade-5.sql: Remove it.
* Makefile.am (dist_sql_DATA): Adapt it.

Makefile.am

@@ -86,11 +86,7 @@ nodist_webobject_DATA =				\
 dist_pkgdata_DATA = src/schema.sql
 
 dist_sql_DATA = 				\
-  src/sql/upgrade-1.sql				\
-  src/sql/upgrade-2.sql				\
-  src/sql/upgrade-3.sql				\
-  src/sql/upgrade-4.sql				\
-  src/sql/upgrade-5.sql
+  src/sql/upgrade-1.sql
 
 dist_css_DATA =					\
   src/static/css/cuirass.css			\

src/sql/upgrade-2.sql

-BEGIN TRANSACTION;
-
-DELETE FROM Workers;
-ALTER TABLE Workers ADD COLUMN machine TEXT NOT NULL;
-
-COMMIT;

src/sql/upgrade-3.sql

-BEGIN TRANSACTION;
-
-ALTER TABLE Builds ADD COLUMN last_status INTEGER;
-
-COMMIT;

src/sql/upgrade-4.sql

-BEGIN TRANSACTION;
-
-ALTER TABLE Builds ADD COLUMN weather INTEGER;
-CREATE INDEX Builds_weather_evaluation ON Builds (weather, evaluation);
-
-COMMIT;

src/sql/upgrade-5.sql

-BEGIN TRANSACTION;
-
-ALTER TABLE Specifications ADD COLUMN notifications TEXT;
-
-COMMIT;