Add in PBKDF2 interface.
Add in PBKDF2 interface.

Also fix some out-of-date API docs.

svn path=/trunk/kdesupport/qca/; revision=400463

Esf-Software/qca,KDE/qca,Esf-Software/qca,JoshuaKolden/qca,sladage/qca,KDE/qca,oktavarium/qca,highfidelity/qca,highfidelity/qca,JoshuaKolden/qca,karolherbst/qca,sladage/qca,sladage/qca,Bjoe/qca,karolherbst/qca,oktavarium/qca,JoshuaKolden/qca,karolherbst/qca,KDE/qca,KDE/qca,JoshuaKolden/qca,Bjoe/qca,Esf-Software/qca,sladage/qca,Esf-Software/qca,Bjoe/qca,highfidelity/qca,oktavarium/qca,oktavarium/qca,Bjoe/qca,highfidelity/qca,karolherbst/qca