[augeas-devel] Misc fixes (incl RHBZ 761246

[lutter at redhat.com]

These patches ultimately are there to address
https://bugzilla.redhat.com/show_bug.cgi?id=761246 in 5/5

On the way, in 4/5, they address a problem with the square lens, where
create wasn't triggered in all cases where that was necessary.

I don't think that these patches should cause compatibility issues for
Sysconfig users, but would like to hear from anybody who thinks they do.

David