Replace HAVE_TCL_GT_84 by the macros TCL_MAJOR_VERSION and TCL_MINOR_VERSION from the Tcl include file. This way the definition of TclFormatInt no longer depends on the version found from tclsh. (This led to link problems if there was a discrepancy between the include files found by CMake and the Tcl shell).
Replace HAVE_TCL_GT_84 by the macros TCL_MAJOR_VERSION and TCL_MINOR_VERSION from the Tcl include file. This way the definition of TclFormatInt no longer depends on the version
found from tclsh. (This led to link problems if there was a discrepancy between the include files found by CMake and the Tcl shell).

Note that we can simplify the configuration procedure as a consequence.

svn path=/trunk/; revision=10772

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot