Support for single memory block operations

[jbrezmorf]

• support one big arena allocation containing data and processors from more Parser instances
• implement sort of Parser manager operating on single continuous block of memory optimizing cache
• will be created in GenricAssembly and used by all computation objects used during assembly:
  field caches, FieldFE FeValues, BParser processors, ...

[jbrezmorf]

• would be nice to have support for recreation of objects in the Arena, the pointers would be special objects, whenever we need actuall address of an object we check if it is actually in the Arana, if not, there has to be a function to initialize the object in the Arena.