Renamed gx_reconfig_4, 8, 12 into ip_stratixiv_gx_reconfig_4, 8, 12, and added...

Renamed gx_reconfig_4, 8, 12 into ip_stratixiv_gx_reconfig_4, 8, 12, and added generic wrapper ip_stratixiv_gx_reconfig.vhd.
The gx_reconfig_4 is used by the tse_sgmii_gx.
The gx_reconfig_4, 8, 12 were were originaly in $UNB regenerated with Quartus v10.1, because the v9.1 version of ../gx_reconfig_12.vhd yielded a simulation error with the altera_mf.vhd model of v10.1.