add reserved tags concept to tql

TQL

@@ -2,23 +2,23 @@
 Tag Query Languag
 ==================
 == by examples ==
-seblu> list id					#list all ids, same as list
-seblu> list a					#list all accounts
-seblu> list h:fw*				#list all hostname starting by fw
-seblu> list r=hv				#list all hypervisor
-seblu> list r=vm				#list all vm
-seblu> list hv=toto				#list vm of hypervisor toto
-seblu> list hv=toto&h=chiche	#list vm chiche of hypervisor toto
-seblu> list r=vm&cpu=2			#list vm with 2 cpu
-seblu> list r=vm&cpu=2&mem>10g	#list vm with 2 cpu and mem > 10g
-seblu> list r=hv&cpu=2&mem>10g	#list hypervisor with no vm
-seblu> list cpu>=2$pop$alloc	#list object with at least 2cpu and show tags pop and alloc
-seblu> list r=vm^10				#list first 10 vm
-seblu> list r=vm^:10			#list last 10 vm
-seblu> list r=vm^5:10			#list vm
-seblu> list r=vm%vm				#list vm sorted by vm
-seblu> list r=vm%vm%cpu			#list vm sorted by vm and cpu
-seblu> list r=vm&-cpu			#list vm without tag cpu
+seblu> list id                  #list all ids, same as list
+seblu> list a                   #list all accounts
+seblu> list h:fw*               #list all hostname starting by fw
+seblu> list r=hv                #list all hypervisor
+seblu> list r=vm                #list all vm
+seblu> list hv=toto             #list vm of hypervisor toto
+seblu> list hv=toto&h=chiche    #list vm chiche of hypervisor toto
+seblu> list r=vm&cpu=2          #list vm with 2 cpu
+seblu> list r=vm&cpu=2&mem>10g  #list vm with 2 cpu and mem > 10g
+seblu> list r=hv&cpu=2&mem>10g  #list hypervisor with no vm
+seblu> list cpu>=2$pop$alloc    #list object with at least 2cpu and show tags pop and alloc
+seblu> list r=vm^10             #list first 10 vm
+seblu> list r=vm^:10            #list last 10 vm
+seblu> list r=vm^5:10           #list vm
+seblu> list r=vm%vm             #list vm sorted by vm
+seblu> list r=vm%vm%cpu         #list vm sorted by vm and cpu
+seblu> list r=vm&-cpu           #list vm without tag cpu
 
 == Basics ==
 - TQL build a list of objects in one query
@@ -72,13 +72,19 @@ n:m limit from n to m objects
 1g = 1000 ^ 3
 1gi = 1024 ^ 3
 
-== well known tags ==
+== reserverd tags ==
+Reserved tags are tags with a special meaning and cannot be set or remove
+directly by clients
+
 id: object unique identifier (eg: kvmlab-1.test5)
 a: account name (eg: bobby)
 r: account role (host/hv/vm/cli/web/spv)
-h: hostname (eg: access)
+closed: account close status
 con: connection uptime in seconds or offline (eg: 3600)
 ip: ipv4 of connection
+
+== well known tags ==
+h: hostname (eg: access)
 hv: hypervisor name (eg: kvmlab-1)
 htype: hypervisor type (xen/kvm)
 libvirtver: Libvirt version