* error can be due to bad user or password
* added login/logout and related private functions
* handle case when userLogin fails, current code returns PHP error for and API throw is not called
* formatting
* converted login params to POST, removed user=&pass= for other APIs
* formatting
* add auth check back but leave out login/out
* fixes to make it work across zmN, postman and curl
* added back enabled check
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