The functions do not set errno on all invalid input, so it's best to check
endptr.
Also, strtoll is now used for server id scanning through QueryResult.
The GCC 4.4.7 implementation of std::to_string only has overloads for long
long int, long long unsigned int and long double. It's better to use
std::stringstream with this version of GCC to avoid having to write custom
code.
MASTER_GTID_WAIT uses gtid_slave_pos when comparing to the target gtid. This creates
problems with multi-domain gtids. It's simpler to just query the server for its
gtids repeatedly. Also, the method is now in MariaDBServer.
Renamed the two gtid-classes to better match MariaDB documentation. One
domain-server-sequence-combination is now a "Gtid", as these identify
a transaction. A "GtidList" contains a list of Gtid:s for handling multi-domain
server variables composed of multiple comma separated Gtid:s.
Removed unused methods and renamed some existing ones. Moved the Gtid-code
to its own file.
