changelog: add various missing bits

templatekw: keep compatibility with Mercurial 4.5 This is simple enough to do.

test: adjust output to stable branch We are about to make a release.

branching: merge with stable

templates: don't alias keywords directly Putting the same function twice in the registry results in duplicate doc strings and therefore confusing "hg help template" output.

stack: remove 'topic.' prefix from colors/labels Stack is related to topics, sure, but it is also good enough to be recognized on its own.

stack: handle hash sizes when --debug flag is provided Since showstack() now uses fm.hexfunc() for node hashes, which depends on ui.debugflag, we should handle situations when hashes are full-sized as well.

stack: always provide (full) node hash to non-default --template

stack: remove unnecessary prefix from stack output with non-default --template "index" template keyword already exists (the current iteration of the loop), so "stack_index" it is. It follows the same convention as other template keywords, such as "files_added", "line_number", etc.

stack: provide context to formatter with non-default --template This allows using template keywords that we don't explicitly provide to the formatter, e.g. rev, branch and topic.