save a copy of pbl.log

Normally we log directly into the target system. But a small part is run in
the instsys and logged there. Keep a copy of this just in case.
update version and changes
Merge pull request #183 from yast/pbl_log

save a copy of pbl.log
Merge remote-tracking branch 'upstream/master'

Conflicts:
	package/yast2-installation.changes