In wsmancli-2.2.3, we notice that the references and associators
enumeration commands cause an inverse request.  That is, a
"references" action command adds a "wsmb:AssociatedInstances" in the
enumeration filter.  And an "associators" action command adds a
"wsmb:AssociationInstances" in the enumeration filter.

An "associators" command DSP0200 section 5.3.2.14 enumerates
"associated" classes. This statement is also defined by DSP0227
section 17.1 where it specifies in section 17.1.7 the use of
"wsmb:AssociatedInstances" element in the filter.

A "references" command DSP0200 section 5.3.2.16 enumerates
"association" classes. This statement is also defined by DSP0227
section 17.1 where it specifies in section 17.1.9 the use of
"wsmb:AssociationInstances" element in the filter.

- Enhance enumerate with association filter to have the ability to
  specify the optional elements namely: AssociationClassName, Role,
  ResultClassName, ResultRole and IncludeResultProperty.
  (IncludeResultProperty is a list, specify it as a comma separated
  list in the “U” option.
  (Chris Poblete)

(This patch was in svn but missing from git :-/)

Attempting to set a property value to an empty string causes invalid XML
characters to be written into the Put request which is then rejected by
the server with a WsMan Fault response.

e.g. wsman put url -k propertyname=""

(Found and fixed by Trevor Witten)

add --version to wsman to print version and build timestamp

style