Remove HOA_VERSION_* constants.
Add enable(Exception|Error)Handler() methods.

Error- and exception-handlers are disable by default. To enable them,
use the appropriated methods.
[auto] Merge from Core

    • #bacb2bc — Remove HOA_VERSION_* constants. (Ivan Enderlin, 2013-11-18)
    • #d3d90b3 — Add enable(Exception|Error)Handler() methods. (Ivan Enderlin, 2013-11-18)

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Merge remote branch 'library-core/master'