This commit is number 2 of 4.

This commit is number 2 of 4.

In particular this commit focuses on:

The guts of the moving about inside passdb.

While these changes have been mildly tested, and are pretty small, any
assistance in this is appreciated.

----

These changes allow for the introduction of  a large dose of 'const' to
the Samba tree.

There are a number of good reasons to do this:

	- I want to allow the SAM_ACCOUNT structure to move from wasteful
	pstrings and fstrings to  allocated strings.  We can't do that if
	people are modifying these outputs, as they may well make
	assumptions about getting pstrings and fstrings

	- I want --with-pam_smbpass to compile with a slightly sane
	volume of warnings, currently its  pretty bad, even in 2.2
	where is compiles at all.

	- Tridge assures me that he no longer opposes 'const religion'
	based on the ability to  #define const the problem away.

	- Changed Get_Pwnam(x,y) into two variants (so that the const
	parameter can work correctly): - Get_Pwnam(const x) and
	Get_Pwnam_Modify(x).

	- Reworked smbd/chgpasswd.c to work with these mods, passing
	around a 'struct passwd' rather  than the modified username

passdb/

	- Kill off disp_info stuff, it isn't used any more - Kill off
	support for writing to the old smbpasswd format, it isn't relevent
	to Samba 3.0

	- Move around and modify the pdb_...() helper functions, adding
	one that sets the last changed  time to 'now' and that sets the
	must change time appropriately.

	- Remove the ugly forced update of the LCT- value in
	pdb_smbpasswd.  - Remove the implicit modification of the ACB
	flags when both NT and LM passwords are set.

	- Removed substation in pdb_getsampwnam output, as a single
	password change will render them  inoperable in any case (they
	will be substituted and stored)

	- Added a default RID to the init_sam_from_pw() function, based on
	our rid algorithm.

	- Added checks that an smbpasswd stored user has a uid-based RID.

	- Fail to store tdb based users without a RID

lib/
    - Change the substituion code to use global_myname if there is
      no connection (and therefore no called name) at the present time.
(This used to be commit 8f607810eb24ed1157bbd2e896c2c167bc34d986)