r6277: This implements a new caching API for enumerating the pdb elements. It is

r6277: This implements a new caching API for enumerating the pdb elements. It is
modeled after query_displayinfo and should hide the differences between users,
groups and aliases while allowing a cache analog load_sampw_entries:

struct pdb_search *pdb_search_users(uint16 acct_flags);
struct pdb_search *pdb_search_groups(void);
struct pdb_search *pdb_search_aliases(const DOM_SID *sid);
uint32 pdb_search_entries(struct pdb_search *search, uint32 start_idx,
                          uint32 max_entries,
                          struct samr_displayentry **result);
void pdb_search_destroy(struct pdb_search *search);

Why this API? Eventually we will need to apply the work gd has started on
enumerating users with paged ldap searches to groups and aliases. Before doing
that I want to clean up the search routines we have.

The sample application (more to follow) is 'net maxrid'.

Volker