make 'got revert' and 'got rm' work on non-existent directories problem found by robert@ ok jamsek, op

regress: replace "sed -i" with ed(1) for portable in-place editing "sed -i" is fundamentally unportable. GNU and OpenBSD sed(1) treat the extension for the backup file as an optional argument and use "sed -i" for no backup file. FreeBSD sed(1) treats the extension as an obligatory argument and uses "sed -i ''" for no backup file. There is no single syntax that works for both. ok stsp op

regress: replace unportable ln -h option with rm && ln ok stsp

respect umask when creating or changing files and directories This behaviour is already documented in got-worktree(5) but wasn't actually implemented. ok stsp@

regress: adjust expected usage output in "revert_no_arguments" test

always show commit or tree IDs in diff header, in order to help 'got patch' The idea is that got patch can simply look for a line such as: commit - abcde1234567... to find the merge base commit ID to show in diff3 conflict markers. got log -p now displays commit IDs in its diff header, instead ofl tree or blob IDs. ok op@

use test(1) -eq and -ne to compare integers, and reduce quoting This brings the rest of the regression test scripts in line with patch.sh.

sort and de-duplicate work tree path command line arguments This is important in cases like 'got diff file.txt file.txt' which should only show the diff for file.txt once. suggested by kn@

use POSIX [s1 = s2] syntax instead of [s1 == s2]; patch by Ryo ONODERA

switch function declarations from Korn shell to Bourne/POSIX shell syntax ok stsp

add a -q option to tests for quiet output and use it for 'make regress' Previous default output remains when test cases are run individually. ok tracey

fix wrong test result check in revert.sh symlink test

fix missing return statements in revert.sh symlink test failure cases

add support for symlinks to 'got revert -p'

add a test for 'got revert' with symlinks