#986296 by blup, tstoeckler, Damien Tournoud, carlos8f: Fixed _node_types_build() accidentally marks node types as disabled

- Patch #826380 by David_Rothstein, sun: empty filter objects for new/unconfigured filters are incomplete.

#987102 by Jeff Burnz, tim.plunkett: Fixed Preview logo not removed when logo theme setting is off in Bartik

#965004 by johnbarclay, mr.baileys: Fixed Mismatched argument/variables in hook_user_login() documentation.

- Patch #991340 by alexpott: user_validate_current_pass() uses global  and not the user object from the form.

- Patch #992564 by wojtha: t() or format_plural() inside watchdog() function call in tracker and action module.

#827528 by tlattimore, ipwa, reglogge, eugene.samoylenko, tim.plunkett, jensimmons, rschwab, amateescu: Fixed No styling for PRE, CODE tags in Bartik

- Patch #854396 by tstoeckler, jhodgdon: improve documentation for date-related functions and hooks in system.module.