Fix #45: Handle relative paths in `run-program`
This is basically the solution proposed by Elias Pipping with a few minor tweaks. - In `run-program`, don't merge `program` with the "path:" search-list. `spawn` will handle this. - In `spawn`, if the first call to execve fails, instead of trying "/bin/sh", use "/usr/bin/env" which will use the user's PATH if necessary to find the program.
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