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largefiles: rewrite merge code using dictionary with entry per file

In overridecalculateupdates(), we currently only deal with conflicts
that result in a 'g' action for either the largefile or a standin. We
will soon want to deal cases with 'cd' and 'dc' actions here. It will
be easier to reason about such cases if we rewrite it using a dict
from filename to action.

A side-effect of this change is that the output can only have one
action per file (which should be a good change). Before this change,
when one of the tests in test-issue3084 received this input (the 'a'
in the input was a result of 'cd' conflict resolved in favor of the
modified file):

  'g': [('.hglf/f', ('',), 'remote created')],
  'a': [('f', None, 'prompt keep')],

and the user chose to keep the local largefile, it produced this
output:


  'g': [('.hglf/f', ('',), 'remote created')],
  'r': [('f', None, 'replaced by standin')],
  'a': [('f', None, 'prompt keep')],

Although 'a' actions are processed after 'r' actions by
recordupdates(), it still worked because 'a' actions have no effect on
merges (only on updates). After this change, the output is:

  'g': [('.hglf/f', ('',), 'remote created')],
  'r': [('f', None, 'replaced by standin')],

Similarly, there are several tests in test-largefiles-update that get
inputs like:

  'a': [('.hglf/large2', None, 'prompt keep')],
  'g': [('large2', ('',), 'remote created')],

and when the user chooses to keep the local largefile, they produce
this output:

  'a': [('.hglf/large2', None, 'prompt keep'),
        ('.hglf/large2', None, 'keep standin')],
  'lfmr': [('large2', None, 'forget non-standin largefile')],

In this case, it was not a merge but an update, so the 'a' action does
have an effect. However, since dirstate.add() is idempotent, it still
has no obserable effect.

After this change, the output is:

  'a': [('.hglf/large2', None, 'keep standin')],
  'lfmr': [('large2', None, 'forget non-standin largefile')],

#!/usr/bin/env python
#
# An example hgweb CGI script, edit as necessary
# See also http://mercurial.selenic.com/wiki/PublishingRepositories

# Path to repo or hgweb config to serve (see 'hg help hgweb')
config = "/path/to/repo/or/config"

# Uncomment and adjust if Mercurial is not installed system-wide
# (consult "installed modules" path from 'hg debuginstall'):
#import sys; sys.path.insert(0, "/path/to/python/lib")

# Uncomment to send python tracebacks to the browser if an error occurs:
#import cgitb; cgitb.enable()

from mercurial import demandimport; demandimport.enable()
from mercurial.hgweb import hgweb, wsgicgi
application = hgweb(config)
wsgicgi.launch(application)