New Package & 2 New Classes

New package -- com.mordoch,chemtools.formulatools -- that provides a way
to represent chemical formulas as Java objects as well as convert a
string such as "C6H12O6" into a Java object. For now, Parser has been
renamed to FormulaHelper and moved into this package. Analysis now
implements these features (see if you can sniff around and find them).
Also, some of the documentation is incorrect, but I'll worry about that
later.