afc/ward decomposition for embedded HVDC

[alefcastelli]

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Performance Results

Version	Precompile Time
Main	1.869578039
This Branch	1.889740657

Version	Execute Time
Main-Build PTDF First	3.708752014
Main-Build PTDF Second	0.133474029
Main-Build Ybus First	0.343788725
Main-Build Ybus Second	0.006984718
Main-Build LODF First	0.754000638
Main-Build LODF Second	0.183193474
This Branch-Build PTDF First	3.615746103
This Branch-Build PTDF Second	0.085165693
This Branch-Build Ybus First	0.336960912
This Branch-Build Ybus Second	0.00695866
This Branch-Build LODF First	0.756507305
This Branch-Build LODF Second	0.190960843

[jd-lara]

closed in favor of #96