Return null if the string to deserialize to a XenRef<T> is null.

This can happen for calls returning a XenRef<T> when the server is using the
JsonRpc v1.0 and we have an error, in which case the result is null. Similarly,
return DateTime.MinValue when the datetime string is null (or in general
unparasable).

Signed-off-by: Konstantina Chremmou <konstantina.chremmou@citrix.com>

CA-284233: Added converter to serialize null values in string-string …

…maps to empty strings.

Signed-off-by: Konstantina Chremmou <konstantina.chremmou@citrix.com>

CA-283697: Avoid resetting a field to null when creating an object fr…

…om a Hashtable not containing the field.

Created a new method to update an object from a Hashtable setting only the
fields contained in the Hashtable. Changed the class constructor from Hashtable
to initialise the fields with their default values and only set the ones
contained in the Hashtable instead of resetting them to null.
Also, simplified the methods in the Marshalling class, mostly to make the change
in the generation code easier.

Signed-off-by: Konstantina Chremmou <konstantina.chremmou@citrix.com>

Replaced package xapi-stdext-std with astring.

Signed-off-by: Konstantina Chremmou <konstantina.chremmou@citrix.com>

Merge pull request xapi-project#136 from xapi-project/json

Merge request from json (REQ-420) into master.

Merge branch 'master' into json

# Conflicts:
#	csharp/templates/XenServer.csproj.mustache
#	powershell/common_functions.ml

Reverted setting ulimit; it's to no avail since it's outside the cont…

…ainer.

Signed-off-by: Konstantina Chremmou <konstantina.chremmou@citrix.com>

Merge pull request xapi-project#131 from kc284/msbuild

XenServer.NET and PS module project file updates.

Merge pull request xapi-project#129 from kc284/master

Namespace and assembly metadata correction.

Autogenerate the java test GetAllRecordsOfAllTypes so it is kept up t…

…o date with the available API objects.

Signed-off-by: Konstantina Chremmou <konstantina.chremmou@citrix.com>