More for ITS#4365 refix CR/LF handling

Was rejecting "-\r\n" in input LDIF
ITS#4365
ITS#7798 fix mdb_entry_decode()
ITS#7798
ITS#7806 fixed memory leak in LDAPAsynConnection.cpp
ITS#7806
ITS#7803 reference slapd-config(5)

Also replace BDB example with LMDB
ITS#7803
ITS#7723 fix reference counting
ITS#7723
ITS#7587 fix double-free

Related to bb3e14ddba025229816e0bc5bfd0228fbaed6985 (ITS#6254)
ITS#7587
Recommend mdb, deprecate BDB
ITS#7827 slapacl requires a valid suffix
ITS#7827
4365->4635