LDAP extensions, take 3

Here's the third version of the patch introducing the new add/modify/delete functions to the LDAP API. This patch obsoletes the previous ones. Unlike the previous one, this one maintains compatibility with the former ldap-search function API released in 21.1 which should satisfy Kyle. For reference here's a summary of the changes introduced by this patch: The LDAP code design remains unchanged, it consists of two layers: - a low level layer that closely matches the C LDAP API. These functions that used to be named `*-internal' are now named more simply: `ldap-open', `ldap-close', `ldap-search-basic', `ldap-add', `ldap-modify'. They should be used directly for very specific purposes (such as multiple operations on a connection) only. - a higher-level layer provides a more convenient way to access LDAP directories hiding the subtleties of handling the connection, translating arguments and ensuring compliance with LDAP internationalization rules and formats (currently partly implemented only). This layer provides atomic operations for searches, modification, addition and deletion of multiple entries at once: ldap-search-entries, ldap-add-entries, ldap-delete-entries and ldap-modify-entries Ta maintain compatibility `ldap-search' is now a wrapper that calls either `ldap-search-basic' or `ldap-search-entries'. It's declared as obsolete since a direct call to one of these two functions is more efficient and should therefore be preferred. Please notify me if the patch is accepted so I can update the documentation too. Oscar 1999-11-27 Oscar Figueiredo <Oscar.Figueiredo(a)di.epfl.ch&gt; * eldap.h (Fldap_search) Renamed from Fldap_search_internal: (Fldap_add, Fldap_modify, Fldap_delete): New functions * eldap.c (Qadd, Qreplace): New constant symbols (Fldap_open): Use the LDAP_OPT_RESTART option to avoid interruptions by XEmacs signals Remove unnecessary calls to slow_down_interrupts and speed_up_interrupts (Fldap_search_basic): Renamed from Fldap_search_internal Added new optional parameter VERBOSE that triggers the display of progress messages Remove unnecessary calls to slow_down_interrupts and speed_up_interrupts LDAP result code analysis rewritten (Fldap_add, Fldap_modify, Fldap_delete): New functions (syms_of_eldap): Define the new symbols and functions 1999-11-27 Oscar Figueiredo <Oscar.Figueiredo(a)di.epfl.ch&gt; * ldap.el (toplevel): Test if LDAP support has been compiled in (ldap-verbose): New option (ldap-search-entries): Renamed from the previous ldap-search Conditionalize message display on ldap-verbose (ldap-add-entries, ldap-modify-entries, ldap-delete-entries): New defuns (ldap-search): Is now defined as an obsolete wrapper calling ldap-search-basic or ldap-search-entries