template: fold template() into __call__, minor optimizations
- use non-grouping operator to avoid some extra processing
- avoid copying and updating defaults
- unnest main template body
- avoid returning extra empty string if format
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
removing b
abort: update spans branches, use 'hg merge' or 'hg update -C' to lose changes