Use ZCB "iterator" in Highlighter#Raw_Excerpt
Always trim tail of raw_excerpt
Eliminate CB_setf in LexiconWriter
Eliminate CB_setf in SortFieldWriter
Eliminate CB_setf in SortReader
Eliminate CB_setf in SortWriter
Eliminate CB_setf/CB_catf in Store::Folder
Eliminate CB_setf in FilePurger
Eliminate CB_setf in Store::SharedLock
Add utility function TestUtils_modules_folder
Eliminate CB_setf in TestJson
Eliminate CB_Chop in BackgroundMerger and Indexer
Eliminate CB_Chop in Store::Folder
Eliminate CB_Chop in Clownfish::Err
Eliminate CB_Mimic in Highlighter
Eliminate CB_Mimic in PolyReader
Eliminate CB_Mimic in Store::FileHandle
Eliminiate CB_Mimic in Store::InStream
Eliminate CB_Mimic_Str in RegexTokenizer
Change DH_Get_Entry semantics

Now DH_Get_Entry must be called after DH_Next and it returns an incref'd
CharBuf. Eliminates a couple of calls to CB_Mimic.