cosmetics, put yuck_cnt_slot on the same line as the append
hygiene, check return value of yuck_append()
Merge branch 'tmpl/coru'

* tmpl/coru:
  hygiene, check return value of yuck_append()
  cosmetics, put yuck_cnt_slot on the same line as the append
cosmetics, attribeautify bbuf_cat() and bbuf_cpy() with nonnull constraints
minor, turn to allocz + index variant of buffers
Merge branch 'code/hygiene'

* code/hygiene:
  minor, turn to allocz + index variant of buffers
  cosmetics, attribeautify bbuf_cat() and bbuf_cpy() with nonnull constraints
test, provide regression for bzr hash mix-up
fix, disambiguate b in hash section for bzr vs. hex digit b
Merge branch 'cmd/scmver'

* cmd/scmver:
  fix, disambiguate b in hash section for bzr vs. hex digit b
  test, provide regression for bzr hash mix-up
minor, allow reference file to be `-' (for stdin/stdout)
test, provide regressions for reading reference from stdin
Merge branch 'cmd/scmver'

* cmd/scmver:
  test, provide regressions for reading reference from stdin
  minor, allow reference file to be `-' (for stdin/stdout)