Imagemounter

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* Improve support for some types of disk images
* Some changes in the way some command-line arguments work (removed :option:`-vs`, :option:`-fs` and :option:`-fsf`)

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* Make :option:`--stats the default
* Print the volume size and offset in verbose mode in the CLI
* Add imount as command line utility name

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* Add :option:`--keep`

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* Use fallback commands for base image mounting if the normal one fails
* Add multifile option to Volume to control whether multifile argument passing should be attempted
* Fix error in backwards compatibility of mount_partitions
* Copy the label of a volume to the last mountpoint if it looks like a mountpoint

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* Ability to automatically detect the mountpoint based on files in the filesystem

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* Partition is now Volume
* Store the volume flag (alloc, unalloc, meta)