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Usage

The addpath routine adds a set of directories to the current path.
The first form takes a single directory and adds it to the beginning
or top of the path:

  addpath('directory')

The second form add several directories to the top of the path:

  addpath('dir1','dir2',...,'dirn')

Finally, you can provide a flag to control where the directories get
added to the path

  addpath('dir1','dir2',...,'dirn','-flag')

where if flag is either '-0' or '-begin', the directories are
added to the top of the path, and if the flag is either '-1' or 
'-end' the directories are added to the bottom (or end) of the path.
