Update to 3.4.2:

Mercurial 3.4.2 (2015-07-01)

changegroup: properly compute common base in changeggroupsubset (issue4736)
crecord: fix a typo introduced when moving crecord to core
crecord: fix three typos introduced while moving crecord into core
hgwebdir: avoid redundant repo and directory entries when 'web.name' is set
hgwebdir: don't allow the hidden parent of a subrepo to show as a directory
parsers: do not cache RevlogError type (issue4451)
pull: avoid race condition with 'hg pull --rev name --update' (issue4706)
templater: do not preprocess template string in "if" expression (issue4714)
templater: evaluate arguments passed to diff() appropriately
templater: parse \"...\" as string for 2.9.2-3.4 compatibility (issue4733)
transplant: only pull the transplanted revision (issue4692)
transplant: update test to use hash for remote transplant

(wiz)