alias: back up and restore commands.norepo before checking for shell aliases

tests: unify test-check-code

keyword: switch kwtemplater.record in kw_dorecord() Obsoletes the need for a global recordcommands variable.

keyword: specific regular expressions depending on read mode More safeguarding against accidental (un)expansion: Reading filelog: act only on \$(kw1|kw2|..)\$ as keywords are always stored unexpanded. Reading wdir: act only on \$(kw1|kw2|..): [^$\n\r]*? \$ as we only are interested in expanded keywords in this situation. Note: we cannot use ..): [^$\n\r]+? \$ because e.g. the {branch} template might be empty. hg record is a special case as we read from the working directory and need one regex each for modified and added files. Therefore test recording an added file. This way we finally also forbid sequences like $Id: $ being treated as keywords.

test-keyword: remove remaining sed calls

keyword: disable expansion in kwfilelog.read() if file renamed in node Simplifies kwfilelog.cmp() and avoids fiddling with/importing revlog. Reorder imports alphabetically.