vmwizard: added the check and fields needed for min/max ram.

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virtualmachine form: added validation

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virtualmachine form: done() handles ganeti26

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temlate to instance: beparams handles ganeti26

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VirtualMachine model: Handles min/max mem

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migration: added for the VM change. Works backwords as well.

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models: more max/minmem changes

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template to instance: forgot imports, removed ram reference

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models: fixed up parsing persistant info for VMs

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vm: properly check for maxmem in beparams

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vm-test: updeated test for min/maxmem change

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cluster-test: fixed up cluster.test_avail_ram for the maxmem change

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node-test: update some stuff for the maxmem change

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vm-create-test: update for maxmem change

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models: properly check for stuff in dicts

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cluster-user-tests: update for maxmem

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vm: fiked an old refernce to vm.ram

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models: more ram to maxmem changes

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cluster: more ram->maxmem changes

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vm: more ram->maxmem changes

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