Uniform treatment of input directory

[squaremo]

If you use

jk run ./examples/foo/index.js

then the input directory is ./examples/foo, whereas if you use

jk run -m ./examples/foo/index.js

then the input directory is .. In fact, for everything except for running a file, the input directory defaults to the current directory. It should really always be the current directory, unless changed by -i.

(@dlespiau We had a long discussion of how input directories should work, which I cannot now find)