checksum key-value store is defined.
factory builder of key-value store is defined.
server command. added key-value store checksum option.
debug-dump-kvs command. added entry size dump option.
debug-dump-kvs command. changed key-value store type description at command line. added key-value store checksum option.
changelog:
* lib/rims/cmd.rb: added entry size dump option to debug-dump-kvs command.
changelog:
* lib/rims/cksum_kvs.rb, lib/rims/kvs.rb, lib/rims/server.rb, lib/rims/cmd.rb: checksum key-value store is defined. server mailbox data is verified with checksum at default.
Merge branch 'kvs_cksum'

Conflicts:
	ChangeLog