Fix missing docs/common in common manifest.

Nick Suckling.

scripts when they capture stdout to get the box version, for example.

some users want to set them equal to ensure that no files are ever
deleted by housekeeping.

relative paths in test configuration on Windows.

BackupStoreRefCountDatabase::RemoveReference.

correct before overwriting or deleting it.

missing.

they're wrong.

Add a callback interface to decouple housekeeping from the 
BackupStoreDaemon, allowing it to be called directly in tests.

Allow housekeeping callers to request it to keep trying forever to get a 
lock on the account if it's busy.

TEST_EQUAL_LINE, so that it can be used to report object IDs for 
example.

Make refcount_t unsigned and make its definition public.

housekeeping directly.

style.

Create a refcount database when creating a new account.

Add an easier way to get the account root directory.

style.

BackupStoreAccountDatabase::GetEntry return a copy of the new entry. 

filename constructor of FileStream.