CVE-2013-2249 mod_session_dbd: Make sure that dirty flag is respected when saving sessions, and ensure the session ID is changed each time the session changes.

Axed C++ comments.

formatting: space vs tab

mod_session_dbd: fix a segmentation fault in the function dbd_remove. The segmentation fault is caused by an uninitialized function pointer session_dbd_acquire_fn. PR 53452

Add lots of unique tags to error log messages

mod_session_dbd: Use apr_status_t as a return code across the mod_session API.

Remove some more now redundant log prefixes

break some very long lines, no code change

Use the new APLOG_USE_MODULE/AP_DECLARE_MODULE macros everywhere to take advantage of per-module loglevels

Enhance ap_hook_monitor to pass along a server_rec (in general the ap_server_conf) and tuck away some storage in there which may be useful as an opaque data pointer.

mod_session_cookie, mod_session_dbd: Make sure cookies are set both within the output headers and error output headers, so that the session is maintained across redirects.

You don't export registered entry points

Change the directives within the mod_session* modules to be valid both inside and outside the location/directory sections, as suggested by wrowe.

Insert prototypes to remove compiler warnings. [Joe Orton]

No var declarations in the middle of the code.

Remove all references to CORE_PRIVATE.

Fix the defaults, which currently override the config instead of default the config. [Ruediger Pluem]

Optimisation: We have no need to distiguish between a Cookie and a Cookie2 when reading cookies, the cookie read code reads both at once. [Ruediger Pluem]

mod_session_dbd: Add a session implementation capable of storing session information in a SQL database via the dbd interface. Useful for sites where session privacy is important.