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When installed, the name is `lightning-hsmtool`. We actually copy `tools/hsmtool` to `tools/lightning-hsmtool` but that's a silly step which we should get rid of. So: 1. Make sure our documentation always refers to it as lightning-hsmtool. 2. Make sure our tests invoke it as `lightning-hsmtool`. 3. Rename the C file. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>