import: use "getcommiteditor()" instead of explicit editor choice This patch also enhances "test-import-bypass.t" and "test-import.t", because "hg import" hasn't been explicitly tested around editor invocation and "--edit" option. This patch explicitly tests below: - with "--bypass" (regardless of "--edit"): - not invoked, if the patch contains the commit message - not invoked, if the commit message is explicitly specified - invoked, otherwise (just adding comment) - without "--bypass": - with "--edit": - not invoked, if "--no-commit" is not specified - invoked, otherwise - without "--edit": - not invoked, if the patch contains the commit message - not invoked, if "--message" or "--logfile" is specified (just adding comment) - invoked, otherwise