[BUG] create_solar() ignores all power related arguments

[wfvining-snl]

Describe the bug
The create_solar() function ignores the following arguments:

• pg_ub
• pg_lb
• qg_ub
• qg_lb
• qg
• pg

Minimum Viable Example

create_solar("foo", [1, 2, 3, 4], WYE,
             pg_lb=[0,0,0,0],
             pg_ub=[100,100,100],
             qg_lb=[-15, -15, -15],
             qg_ub=[15, 15, 15],
             pg=[0,0,0],
             qg=[0,0,0]
             )

Returns:

Dict("bus" => "foo", "connections" => [1, 2, 3, 4], configuration => WYE, "status" => ENABLED)

Expected behavior
The returned Dict should include the pq_[ub/lb], qg_[ub/lb], pg, and qg keys as specified in the function arguments. These keys are included in "solar" objects that are parsed from an OpenDSS model.

System Information (please complete the following information):

• OS: Windows
• Version: v0.14.1