cronic: turn the caller's verbose off for cronic itself; generate all SHELLOPTS test wrappers with one function

[mernst]

verbose. When the caller's verbose was on (bash -v cronic, or verbose in an exported SHELLOPTS), cronic echoed its entire source to stderr. Now cronic saves and turns off -v along with -a and -x, and restores it for the command. The block that does so is now at the top of the script, because bash echoes each line as it reads it until set +v runs; so under verbose, cronic still echoes its first 6 lines. A new test checks that it echoes nothing more.

Test wrappers. make_cronic_wrapper now also generates the xtrace wrapper, rather than a separate heredoc duplicating it. Every wrapper now unsets BASH_ENV, so that cronic does not run the user's startup file with the exported option on, and discards its own stderr (and so its own trace).

The test that collects the variable names that cronic assigns now also matches an assignment after { .

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[mernst]

Closing in favor of #136, which has the same cronic --help text about not exporting verbose, in the same place, and a more thorough approach to the SHELLOPTS tests.