- Added the -nice option for nicing the build processes.

- Added the -gnuplotscript option to specify the GnuPlot script to use.
- Added the -templatefile option to specify the HTML template to use.
- Moved subroutines to top of file.
- Used variables for file names in case we want to change to directories.
- Made program track its directory changes in $VERBOSE mode (for debugging)
- Added variables to support tracking start time, finish time, and platform
  details about each nightly test.

llvm-svn: 14321