* it supports white spaces
* it supports , and . for the decimal point
* it gives parse errors and where the error occured
* it supports more functions
I also added evaluating an expression given on the command line, it doesn't
show the UI then.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17774 a95241bf-73f2-0310-859d-f6bbb57e9c96
