editor: use SimpleStringIO in apply_text() The design is a little ugly as the data stored in _openfiles will be a string or a SimpleStringIO depending on the file having been edited or not but this is a simple way to avoid allocating large blocks of data. This is also a bet the output stream passed to apply_text() is only being written and never seeked or read.

include Makefile hgsubversion/help/*.rst
recursive-include tests *.py *.sh *.svndump *.txt