Small improvement for transforming sums of products
Fixed some tests which failed because of syntax changes.

(7 + x) /= (x + 7)...
Fix parser bug

After s, it always expected sin (same for cos, tan)
Rename Euler constant to eu
Simplify's now able to better factor out in fractions

Before:
simplify $ ((y * x * y) / (x * y * y)) --> x * (y)^(2.0) * (x * (y)^(2.0))^(-1.0)
Now:
simplify  $ ((y * x * y) / (x * y * y)) --> 1.0
Some more little changes without huge effect.
Removed superfluous multiplication with 1
enhanced simplifySum's factor-out entry point
Add parsers for Abs and Signum
New exp rule: euler^(ln(x) * y) = x^y

And some tests testing this as well as (x^y)^z = x^(y*z)
Infrastructure for pulling common exponents out of a product
Re-structured chaos at the bottom of Symmath.Simplify (a bit)

It's still a mess...
Restored canceling abilities

re: existential crisis
Six more tests will improve test coverage a lot.
Added some paragraphs to the README

About "Comparison", "Modularization", "Testing".
Improved product transformation etc
Could remove three other rules from simplifyProd
Symmath, Release III.

Merge branches 'pu/simplify', 'pu/parse' and 'pu/funtable' into next
Two rules (Fraction, Power simplification)

1. Simplifies [0 / term] -> 0
2. Simplifies e.g. [exp(x) * exp(y)] -> [exp(x+y)]
Introduced explicit rules for Ln/Log