Added support to program Z1 far memory with BSL

The BSL script for the z1 was lacking functionality to program the far memory of the msp430. 
To create binaries with far memory support requires msp430-gcc version 4.7.x and appropriate CFLAGS and LDFLAGS (see http://sourceforge.net/apps/mediawiki/mspgcc/index.php?title=Gcc47:20-Bit_Design)