#192692 by jrbeeman and mfer: (security) protect profile category page menu items with the visibility settings already available

- Patch #179143 by Gabor, JirkaRybka, chx, ChrisKennedy, et al: do not fire bootstrap hooks during update.

#192659 by quicksketch: center table headers for checkbox columns, where checkboxes are also centered

#189409 follow up note by Steven Wittens: administrator entered text should be filtered with filter_xss_admin(), not the less permissive filter_xss()

#190899 by bjaspan: (regression) return the queries performed in drupal_install_schema() and drupal_uninstall_schema(), so module install hooks can report on creation of tables, or failures, as it was in Drupal 5

#189409 by Arancaytar: use filter_xss() to filter content type descriptions, instead of printing them verbatim (on one occassion) and printing them with check_plain() erroneusly on another

#191310 by JirkaRybka, keith.smith: ship with a files directory by default and improve installation error messages checking for all requirements on the same screen, instead of putting the user through individual error screens

#190206 by myself: move misplaced Javascript codes from the form definition to where the form is output

Wrap foreach(explode()) in empty() check, so if empty items are found, the foreach will not bail out on the explode(). Identified in upgrade testing.

#191767 by k4ml: system_modules() is undefined in the update function, as it was moved out to system.admin.inc, so we need to include that

- Patch #187799 by greggles et al: fixed problem with revisions being associated with the wrong user.

- Patch #191116 by david: make drupal_urlencode() rfc 1738 compliant to make it work correctly with spaces.

#189870 by O Govinda, keith.smith and catch: more user centric help text for Blog API module, standardizing on 'blog' terminology also

#191104 by keith.smith: (usability) change occurances of node to 'post' and 'content' as appropriate

#188914 by Pasqualle: type and language filtering on node admin page was broken due to missing breaks in switch

#190283 by myself and JirkaRbyka: use get_t() in pre-database setup code, add missing javascript key to language objects (kills notices) and document st() better

#172584 by myself, keith.smith, yoroy, O Govinda and catch: help text for content translation module