Changes
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* currently we write checkpoint files with '''*.img''' extension, which might be confusing since this extension is a way overloaded by meaning and quite widespreaded, thus it might be worth to change extension to '''*.criu'''
* currently we write checkpoint files with '''*.img''' extension, which might be confusing since this extension is a way overloaded by meaning and quite widespreaded, thus it might be worth to change extension to '''*.criu'''
* mnt_entry::fstype (in mnt.proto) should have enum fstype type
* mnt_entry::fstype (in mnt.proto) should have enum fstype type
* all IDs in image should be in uint64 format (not uint32, like in reg_file_entry), this allows us to use unified ID generator over all images