minor, provide proper backends with delegator routines based on type of mut_stor_t
minor, make sure we assign fields from the super part of an mut_stor_t
test, adapt regressions to new mut_stor_open() signature
minor, kick off layout of mut_stor_s, before it wasn't clear where super belongs
hygiene, go for private version of the stor in bitte-mem.c
hygiene, rename mut_trans_t -> mut_tid_t to lower confusion with a trans instant
minor, free() store in bitte-mem.c upon mut_stor_close()
minor, provide simple berkdb version of our timeline index, using the DB_QUEUE backend
minor, support basic open flags (mirroring fcntl.h's)
hygiene, name bitte-mem routines more betterly
test, provide simple regression for bdb access, mirroring addgetrem_01
chore, add berkdb installation to travis ci file
Merge branch 'backend/berkdb'

* backend/berkdb:
  chore, add berkdb installation to travis ci file
  test, provide simple regression for bdb access, mirroring addgetrem_01
  hygiene, name bitte-mem routines more betterly
  minor, support basic open flags (mirroring fcntl.h's)
  minor, provide simple berkdb version of our timeline index, using the DB_QUEUE backend
  minor, free() store in bitte-mem.c upon mut_stor_close()
  hygiene, rename mut_trans_t -> mut_tid_t to lower confusion with a trans instant
  hygiene, go for private version of the stor in bitte-mem.c
  minor, kick off layout of mut_stor_s, before it wasn't clear where super belongs
  test, adapt regressions to new mut_stor_open() signature
  minor, make sure we assign fields from the super part of an mut_stor_t
  minor, provide proper backends with delegator routines based on type of mut_stor_t