Ndexsignorloader

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* Uploaded networks are now public, searchable, showcased, and fully
indexed by default

* The search for networks to update is done by matching the **labels**
network attribute first and if no match is found, the name is used

* Fixed bug where some networks were laid out on a single horizontal
line. This happened when the `location` attribute for all nodes
in a network were all the same

* Fixed bug where duplicate symbols ended up in `member` attribute of nodes UD-2078

* Uses **labels** network attribute (if found) to find network on NDEx to update instead
of upload as new. If no **labels** match, then any network matching the **name** of
network is updated otherwise network is uploaded as a new network. UD-1677

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* Removed NODE_LABEL_POSITION discrete mapping from style since it is
not compatible with CX 2.0

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* Fixed bug where an empty pathway description file would cause loader to fail. Issue 1

* Removed network visual properties: `NETWORK_CENTER_\*, NETWORK_ HEIGHT, NODE_SELECTION, SCALE_FACTOR, SIZE, WIDTH`
cause they caused problems when displaying the network in Cytoscape

* Fixed bug where URL for DOI in `reference` network attribute was incorrect

* Set minimum version of ndex2 python client to 3.3.1 and maximum to less then 4.0.0

* Set maximum version of ndexutil package to less then 2.0.0

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* **--edgecollapse** flag added which collapses all edges putting all attributes
minus **direct** into lists. For **sentence** attribute each entry the
list is now prepended with href link to citation labeled pubmed: In addition,
if **--edgecollapse** flag is set then a **notes** network attribute is added to
let user know.

* **--style** can also accept NDEx UUID for network style. Network needs to be on same
server set in **--profile**

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* Added commandline flag **--visibility** that lets user dictate whether NEW networks are public or private (default is public)

* Signor Full Human, Signor Full Rat, and Signor Full Mouse networks have been renamed
to Signor Complete - Human, Signor Complete - Rat, Signor Complete - Mouse

* On edges, replaced location attribute value of phenotypesList with empty string NSU-75

* Added __iconurl network attribute and renamed type network attribute to networkType

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* Changed prov:wasDerivedFrom network attribute to just signor website URL for full networks

* Removed author network attribute if no value is found

* Removed labels attribute for full networks