mark some more lemmas with Qed for opacity

    0.05 sec, 147423232 bytes: Generalities/uuu
    15.59 sec, 1502330880 bytes: Generalities/uu0
    0.12 sec, 484474880 bytes: hlevel1/hProp
    0.71 sec, 1295630336 bytes: hlevel2/hSet
    0.83 sec, 1300135936 bytes: hlevel2/algebra1a
    21.21 sec, 1465532416 bytes: hlevel2/algebra1b
    21.39 sec, 1485455360 bytes: hlevel2/algebra1c
    10.80 sec, 1400832000 bytes: hlevel2/algebra1d
    0.53 sec, 1329430528 bytes: hlevel2/hnat
    5.71 sec, 1316339712 bytes: hlevel2/hz
    15.46 sec, 1385086976 bytes: hlevel2/hq
    0.34 sec, 1293991936 bytes: hlevel2/stnfsets
    2.46 sec, 2123694080 bytes: hlevel2/finitesets
    0.09 sec, 361889792 bytes: Proof_of_Extensionality/funextfun

    real 1m37