consistently use SLAP_* malloc macros; alloc sizeof(Syntax *) instead of sizeof(Syntax) for areray of superiors; free resources also in case of failure of syn_insert()

	schema engine updated (but not schema routines so things don't run yet)
	nvalues mostly populated, enough for tests 0-2 to pass
	schema routines needs lots of work
	modify/mods codes needs lots of work

Use LDAP_SLISTs instead of per-struct list management for schema structs
misc cleanup and lint removal

Converted ch_calloc calls to SLAP_CALLOC.

Converted ch_malloc, ch_calloc and ch_realloc calls to SLAP_MALLOC and
SLAP_CALLOC in add_value/add_value_one functions and propagated errors to
all functions that use these functions.