XSPEC bug fixes for tclout plink and fakeit

A couple of recent minor bug fixes...

12.3.1an	For the tclout plink option, it is more useful to output the link string in a format which can be used as input for other parameter commands, such as newpar. Our thanks to Jeremy Sanders for pointing this out. Report added on Oct 15, 2007. The fix is to replace headas/Xspec/src/XSUser/Handler/xsTclout.cxx, and rebuild xspec.
12.3.1ao	When a fakeit run is using a response with first legal channel number (TLMIN4) = 0, and is NOT based on an already existing spectrum, the last channel is erroneously ignored and always ends up with 0 counts. Our thanks to David Morris for pointing this out. Report added on Oct 31, 2007. The fix is to replace headas/Xspec/src/XSModel/Data/SpectralData.cxx, and rebuild xspec.