drop the `is_locked` column
fix tests
remove obsolete comment
removed unused variable
Merge pull request #3020 from gratipay/drop-is_locked

Drop `is_locked` entirely
update i18n files
merge branch.sql into schema.sql
Bump version to 1752
remove obsolete columns from schema.sql
fix schema.sql
Show total given/received on History page. fixes #2930
compute the totals in the python code
replace the multicolumn index by multiple indexes
fix tests
Add test for totals
Merge pull request #3040 from gratipay/show-total-stats

Show total given/received on History page. fixes #2930
update i18n files
merge branch.sql into schema.sql
Bump version to 1753
Rough first cut