[vhdl-200x] librarie/package structure updated to namespaces

Hi everyone,

The library/package structure is quite restrictive compared to the
namespace stuff that can be found in other (computer science) languages.
The namespace paradigm is based on a possible deep tree structure while
the library/package structure implies the tree depth to be equal to 2.

If VHDL supports a deeper structure, fine grained package names could be
allowed. For instance, proc.alu.arith.multiplier would refer to
multiplier components that will be used for the arithmetic part of a
processor ALU.

Nowadays, we can already name such a package “proc.alu_arith_multiplier”
(to follow IEEE package naming convention) but as you can see, the deep
structure is flattened in order to fit in the tree depth = 2.

Cheers,

-- 
Florent Ouchet
PhD Student
CIS/VDS Team - TIMA Laboratory
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