Py-dss-interface

------------------
* BUS methods do not raise errors.

------------------
* Updated OpenDSS to DDLL built as v9.8.0.1
* OpenDSS is using pointers now instead of variants.

------------------
* Tom updated OpenDSS to DDLL built as v9.6.1.2
* Moving away from variant. Capacitor is done. Need other elements
* Tom worked on direct dll with progress bar wired in for daily solution mode

------------------
* Description corrected

------------------
* py-dss-interface version 2 or above does not have backward compatibility with version 1
* Methods replaced by Python property and setter. For example, instead of using dss.lines_read_r1() and dss.lines_write_r1() to read and write, respectively, we can use dss.lines.r1 to either read (variable = dss.lines.r1) or write (dss.lines.r1 = value) in the current version.
* Update OpenDSS version to: OpenDSS Version 9.6.1.1; License Status: Open

------------------
* Code refactored
* PEP 8 in some methods