small improvements about Qc. Beware: Qlt_trans becomes Qclt_trans (as it ought to be)
small improvements about Qc. Beware: Qlt_trans becomes Qclt_trans (as it ought to be)

git-svn-id: a49b465eaba45b67e2e1e4e0b2c256a71f59fecb@10334 85f007b7-540e-0410-9357-904b9bb8a0f7

SamB/coq