Added details about functions
Merge pull request #236 from lbl-srg/electrical_mw

merge revisions of DC package
Added brief info section for */Examples/package.mo
Fixed documentation, missing derivative operator replaced by d/dt
Fixed user guide for Electrical/Transmission/Base package
Added example for linearized DC loads network. Improved DC load model that now has homotopy operator to improve initialization. Updated examples, added new tests, scripts and result files
Resolved some fixmes and updated regression test scripts and results - because some variables have been renamed
Added new examples for the DC package. Updated the regression tests accordingly.
Fixed problem with conditional connectors, to update also AC models
Renamed package Benchmark to Benchmarks, changed it order, and moved grid AL70 in home in there
Updated documentation for the transmission package
renamed Electrical/Transmission/Base in BaseClasses
Resolved fixme and renamed/moved partial models
Added description to variable
Minor modifications to DC package
Minor modifications to Phase systems package
Renamed ground model
Started revision of AC package, added images and documentation
Remove attribute start=0 for the parameter P_nominal
Merge pull request #238 from lbl-srg/electrical

Electrical