Eliminate .cmp files

[aantron]

Christian Lindig (@lindig) has suggested providing a report mode that doesn't require reading the .cmp files, which would be useful in testing environments where they are not readily available (note: see lindig/bisect-summary). In fact, bisect-ppx-report -text - -summary-only doesn't actually need the .cmp (or source) files, but it reads them anyway.

I think it's a good idea to do this at least for -text -summary-only, and probably -text, in any case, but we should remove .cmp files entirely.

• A .cmp file is basically a point list: for each point, its offset into the file and kind. We could inline this information at the top level of each instrumented file, and write it into .out files. bisect-ppx-report would then deduplicate this information when reading those files.
• I never was fully comfortable with the instrumenter writing .cmp files next to the source files as a side effect of operation. That works out fine under some build systems like Ocamlbuild, because the build is done on copies of source in _build, but it seems messy otherwise (even if only as messy as having .cm[iox] files everywhere).
• It should no longer be necessary to use -I with any output mode except HTML, because HTML needs to find the source files.

EDIT: -summary-only does print point kinds.