common parts of libmysql.c and sql/mini_client.cc moved to sql-common/client.c
names of functions now are same in both cases
libmysql/libmysql.c:
many parts moved to sql-common/client.c
libmysqld/Makefile.am:
superfluous files removed
sql/mini_client.cc:
most of the file moved to sql-common/client.c
sql/mini_client.h:
mc_ prefixes were deleted
sql/repl_failsafe.cc:
mc_ prefixes removed
sql/slave.cc:
_mc prefixes removed
