Fix: Missing spaces in printed messages

Several messages are printed with the `print` method and the message
is split across two lines, i.e.:

 print('This is a message split'
       'across two source code lines')

Which causes the message to be printed as:

 This is a message splitacross two source code lines

Add a space at the end of the first line before the line break:

 print('This is a message split '
       'across two source code lines'

Also correct a minor spelling mistake.

Change-Id: Ib98d93fcfb98d78f48025fcc428b6661380cff79
diff --git a/subcmds/rebase.py b/subcmds/rebase.py
index 06cda22..b9a7774 100644
--- a/subcmds/rebase.py
+++ b/subcmds/rebase.py
@@ -68,7 +68,7 @@
       cb = project.CurrentBranch
       if not cb:
         if one_project:
-          print("error: project %s has a detatched HEAD" % project.relpath,
+          print("error: project %s has a detached HEAD" % project.relpath,
                 file=sys.stderr)
           return -1
         # ignore branches with detatched HEADs