keyword: code cleanup - move preselection of expansion candidates for rollback and record into helper function - same overwrite order in rollback and record: 1. modified, 2. added - self.wlock() inside kwrepo class instead of repo.wlock()

tests: asciify output of test-encoding-align.t

tests: accept \-escaped test output It changes tsttest to accept expected outputs in python-style \-escapes. It aims to avoid trouble with outputs for non-ascii, color and progress tests.