Some modifications breaks retrocompatibility of GXS search:
remove horrible templated RsTypeSerializer::serial_process for
RsGxsGroupSummary with hardcoded member names
RsGxsGroupSummary doesn't use old TLV serialization format anymore
RsGxsGroupSummary remove unused description member
RsGxsGroupSummary derive from RsSerializable and use serialization
helper macro
Add autor id and signature flags to the index so there is no need to
retrive them from GXS, thus improving performances
RsGroupNetworkStats initialize members properly
RsGxsGroupSummary rename members to follow usual mMemberName convention
