Commit Briefs
tmac: rename IM (italic manual) to MR (manual reference)
Suggested by G. Brandon Robinson.
tmac: introduce real manual reference macro instead of overloading IR
The overloading of IR emits magic \X'...' sequences that turn into HTML manual links. But not all such IR invocations should be manual links; those had to be written to avoid the IR macro before. Worse, the \X'...' ending the IR causes troff to emit only a single space after a period. Defining a new IM macro for manual references fixes both problems. Fixes #441.
man: more Mercurial references changed to Git
Change-Id: I940a21d67b21b5dd139cb20b9fae9595506fc5ae
man/man1/0intro.1: update supported systems.
LGTM=rsc R=rsc https://codereview.appspot.com/71070050
install(1): cvs -> hg
R=rsc CC=codebot http://codereview.appspot.com/637041