* Replaced all from ...py23 import * with explicit name imports, or removed completely when possible.
* Replaced tounicode() with tostr()
* Changed all BytesIO ans StringIO imports to from io import ..., replaced all UnicodeIO with StringIO.
* Replaced all unichr() with chr()
* Misc minor tweaks and fixes
and viceversa, convert '\n' back to '\r' when reading from XML.
This restores the original newline handling of asciiTable, but only for VOLT's private tables.
