Changed name of plcontf() to plfcont(), as part of the new 2d function plotter API.  plcontf is now a macro for backward compatibility.
Changed name of plcontf() to plfcont(), as part of the new 2d function
plotter API.  plcontf is now a macro for backward compatibility.

Replaced call to plexit() on simple (recoverable) errors with simply
printing the error message (via plabort()) and returning.  Should help
avoid loss of computer time in some critical circumstances (during a long
batch run, for example).

svn path=/trunk/; revision=729

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