exercise 5 Ralf

*  rhs still needs to be implemented more stable
exercise 5 Ralf

* implementation of enumeration time
* code compiles for int & double for rhs, coeffs
* make structure  more scip like
* implementation of error messages

* TODO: rhs still needs to be implemented more stable
Merge branch 'master' of https://github.com/rallenz/appfs

Conflicts:
	ex5/lenz/allocate.c
Merge pull request #42 from rallenz/master

exercise 5 Ralf