Initializing help system before first use

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Problem handling

Mosel can handle several problems in a given model file. A default problem is associated with every model.
Built in type mpproblem to identify mathematical programming problems
- The same decision variable (type mpvar) may be used in several problems
- Constraints (type linctr) belong to the problem where they are defined
The statement with allows to open a problem (= select the active problem):

 declarations
   myprob: mpproblem
 end-declarations
 ...
 with myprob do
   x+y >= 0
 end-do

Modules can define other specific problem types. New problem types can also be defined by combining existing ones, for instance:

  mypbtyp = mpproblem and somepbtype

Problem types support assignment: P1:= P2
and additive assignment: P1 += P2