Update to SophistimaCalc programmable calculator for ipod/iphone

Thanks to suggestions made by John in the comments to SophistimaCalc manual, I have released a new version of SophistimaCalc (free for anyone who has purchased SophistimaCalc paid version) with the following new features:

* new function exp(x), exponent to the power of x

* memories are now kept even on exiting the program

Also, Richard in the comments has made further suggestions that I will implement in the next version coming soon.

Enjoy!!