Fix #228 - Add % in tootip of Memory slider and Fix an issue with xen

XEN hvm domain will take 4096KB more, so if defined 256MB, the domain
will eat 260M, we create a delta according to this to keep the value
coherent
Fix #232 - Workaround wainting for bindings

IBaction need a focus change to trigger the action. So we force the
didChange callback for each textfield.
Fix a default value for Memory in settings.
Merge branch 'master' into UI-Improvements
Merge branch 'master' into UI-Improvements
Improved TNLibvirtDeviceDisk Model to take care of XEN disk configurations

Fix #380 - Define the good format for block devices
Enhancement of the TNLibvirtDeviceDisk Model
Added 3 icones for DISK,NETWORK,FLOPPY
Added DIR disk type
Enhancement of the file size for existing images.
Fix #632 - Update Manual XML Editor from libvirt on call
Merge branch 'master' into UI-Improvements
Fix #627 - Rename Destroy to Force Off (but Keep the meaning of Libvirt Destroy in popup)

Note : at this time tootip for CPSegemented Control segment are not
impletmented.
Fix a crash when defining a XEN domain

Update the TNLibvirtDomain defaultDomainWithType to
defaultDomainWithType AND osType (remove the fixed reference to HVM in
this method).
Merge branch 'master' into UI-Improvements
Better way to handle xen hvm memory delta
77b63a5 addins, missed some statement, correct them now.