This required minor changes to tog.c to teach tog the new test instructions and feed it search terms when driven by the harness. More is needed for these features but this provides some basic coverage for the & and / log keymaps. ok stsp

As reported by naddy, this is a non-portable Korn shell construct. Instead, use the one argument array then make faux space-delimited string "arrays" for the other ids; they can still be indexed with pop_idx. improved by + ok naddy@

Walking the whole file index can take some time. Avoid delaying the perceived start-up time of tog by reading the file index in the background log thread. Problem pointed out by op@ with fixes from + ok jamsek

If tog is invoked in a work tree, prefix the base commit log message summary line with a '*' if the work tree is up-to-date, and with a '~' if the base commit is not up-to-date with respect to the branch tip or it contains mixed commits. While here, plug a couple worktree leaks in cmd_ref() and cmd_tree(). ok stsp@

Allow keywords as arguments to options and operands for the blame, diff, log, and tree commands. Also, return 1 when exiting tog with error rather than 0 so regress can discern success from failure. ok stsp@

requested by mpi@ ok op@

As per stsp's idea: use a more descriptive name, and use the TOG_TEST_SCRIPT envvar both in tog.c and the test scripts. ok stsp@

ok stsp@

Add framework for scripting tog tests by capturing screen dumps to compare with expected output. Includes some preliminary log view tests but lots more tests are needed to cover diff, blame, tree, ref, and help views. ok stsp@