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templater: apply "stringify()" on sub expression to get string correctly

Templating syntax allows nested expression to be specified as parts
below, but they are evaluated as a generator and don't work correctly.

  - 'sep' of 'join(list, sep)'
  - 'text' and 'chars' of 'strip(text, chars)'

In the former case, 'sep' returns expected string only for the first
separation, and empty one for the second or later, because the
generator has only one element.

In the latter case, templating is aborted by exception, because the
generator doesn't have 'strip()' method (as 'text') and can't be
passed as the argument to 'str.strip()' (as 'chars').

This patch applies "stringify()" on these sub expression to get string
correctly.

Mercurial
=========

Mercurial is a fast, easy to use, distributed revision control tool
for software developers.

Basic install:

 $ make            # see install targets
 $ make install    # do a system-wide install
 $ hg debuginstall # sanity-check setup
 $ hg              # see help

Running without installing:

 $ make local      # build for inplace usage
 $ ./hg --version  # should show the latest version

See http://mercurial.selenic.com/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.