couple more todo's
cblrpm-diff: fix use of force lib option
Rpm: map curl to libcurl
Main: use '.' to detect a "package-version"; output a msg when trying a path

Former should fix error when run cblrpm on packages endings in a digit
(reported by Michel Salim in
 https://bugzilla.redhat.com/show_bug.cgi?id=923552)
document changes in 0.7.1