Issue #3082690 by phenaproxima, bnjmnm, oknate, JeroenT, effulgentsia, xjm, lauriii, webchick, seanB, andrewmacpherson, Wim Leers, DyanneNova, Gábor Hojtsy, cboyden, peterx, rainbreaw, jan.stoeckler, shaal, annagaz, FeyP, chr.fritsch, marcoscano, samuel.mortenson, Berdir, webflo: Mark Media Library as a stable core module

- Patch #719730 by anarcat, ctmattice1, peterx: drop the sequences and queue tables from D5 during the D6 to D7 upgrade.

#174993 by peterx, webchick and Freso@freso.dk: WAI AA comformant title for read more links, ie. we are not repeating the same text but include meaningful information