Created class to represent a physical TestStand Structure.
Added function to generate id's

Added Basic template system (better than nothing).
Generation algorithm from LRH is now changed in following ways:

"ensemble0" lines are removed : it is a standard procedure done elsewhere;

"ensemble1" are not stored in memory anymore. They are directly printed;

Sequence indexes are directly named through a variable given in function argument. It should increase readability.

Identifiers are generated directly through function call.
Added missing functions to count and retrieve items.
Functions to generate TestStand are partially working.