Plus42 Equations, Preview Release

[Thomas Okken]

New update:

1. Fixed direct solver for named equations.
2. No longer allowing "=" in named-and-parameterized equations. FAC(N):IF(N=0:1:N*FAC(N-1)) is OK, FAC(N):RESULT=IF(N=0:1:N*FAC(N-1)) is not.
3. In variable menus for named-and-parameterized equations, now showing the parameters in black keys, and any other variables that the function references in white keys.
4. Direct solver now generates code maps for trivial solutions, i.e. when solving for a variable that is already isolated. This means you get more helpful error messages and TRACE output in such cases. (For non-trivial solutions, this is not possible, since there is no source code for those transformed equations.)
5. Lots of memory allocation failure handling added where it was missing before, particularly in the parser and code generator.