#350 Patches for more flexibility

[K.Ono]

Here are some patches that would add more flexibility to the core system.
These are just additional event hooks so should not cause any compatibility problems.
The files are diff from the 2.4.5 RC3 release. I don't know if these would ever make it
to the core but hope it would soon..

Attached files:

• htdocs_include_common.php.diff
  Adds a hook that would allow modules to initialize the current user object and
  its associated session. This combined with other event hooks that are already in 2.4.5 RC3
  such as core.edituser.start, core.register.start, system.admin.users.main.start and etc.,
  any module developer can create a custom user management module that can replace
  the functionality of the core user module.

• htdocs_modules_system_admin_modulesadmin_main.php.diff

• htdocs_modules_system_admin_modulesadmin_modulesadmin.php.diff
  The above 2 patches will add event hooks that are invoked upon successful module install/update/uninstall.
  These hooks are very important for modules that interact or utilize other modules.

[K.Ono]

[K.Ono]

[K.Ono]