add support of "selectMediatypes" for "user.get" and fix support of "userids,mediaids" for "mediatype.get"

See attached patch (based on just released 2.0.0)

(1) Apply the patch to add all time documented but missing in the code parameter "selectMediatypes" for user.get method
http://www.zabbix.com/documentation/2.0/manual/appendix/api/user/get

along with a fix for parameters userids,mediaids for mediatype.get (dummy typo in a table name)
http://www.zabbix.com/documentation/2.0/manual/appendix/api/mediatype/get

(2) Also consider to apply patch to the 1.8 (and also add support of selectMedias from 2.0 to 1.8) or remove declaration of parameters select_medias, select_mediatypes from 1.8 documentation.
http://www.zabbix.com/documentation/1.8/api/user/get

Because it misleads users all these years:
http://www.zabbix.com/forum/showthread.php?t=21042
http://boardreader.com/thread/API_Call_is_failing_any_ideas_why_q2Xhii.html

After patch:

Request:

{ "userids":[3, 7], "selectMediatypes":"refer" }

Response:
"result":[{
"userid":"3",
"mediatypes":[

{ "mediatypeid":"6" }

]
},{
"userid":"7",
"mediatypes":[

{ "mediatypeid":"1" }

,

{ "mediatypeid":"2" }

]
}],

ALL is correct - TESTED