remotenames: add functionality to hoist remotebookmarks
This patch adds the functionality to hoist remotebookmarks to the top level
namespace. The peer of which bookmarks should be hoisted can be set using
`remotenames.hoistedpeer` config option. Only bookmarks can be hoisted. If a
hoisted name and local bookmark exists of the same name, the local bookmark
takes precedence.
While I was here, I documented the default values of two other remotenames
config options.
Differential Revision: https://phab.mercurial-scm.org/D2807
$ hg init
$ touch a
$ unset HGUSER
$ echo "[ui]" >> .hg/hgrc
$ echo "username= foo" >> .hg/hgrc
$ echo " bar1" >> .hg/hgrc
$ hg ci -Am m
adding a
abort: username 'foo\nbar1' contains a newline
[255]
$ rm .hg/hgrc
$ HGUSER=`(echo foo; echo bar2)` hg ci -Am m
adding a
abort: username 'foo\nbar2' contains a newline
[255]
$ hg ci -Am m -u "`(echo foo; echo bar3)`"
adding a
transaction abort!
rollback completed
abort: username 'foo\nbar3' contains a newline!
[255]