Change load() to have no default arguments, makes caller specifiy explicitly...I...

Change load() to have no default arguments, makes caller specifiy explicitly...I think assuming a default arg is bad here.  Also add PackageUse and PackageUseFile, change up the comments a bit.  I've started to notice code re-use here; these are basically the same code.  I think I will write up the rest of the package* classes and then perform code merges to save LOC and memory and whatnot

svn path=/main/trunk/; revision=6192