obsolete: populate successors, precursors, children lazily The precursors and children dictionaries are not used by many commands. By making them lazily populated, 'hg log -r @~10::@ >/dev/null' is sped up from 0.564s to 0.440s on my hg.hg repo with 73k markers. Also make successors lazily populated, mostly for consistency with the others.

obsolete: pass only new markers to _checkinvalidmarkers() We will soon delay populating precursors until we have to. To prepare for that, make _checkinvalidmarkers() scan for a nullid precursor in the list of new markers instead of the (currently) cheaper 'if nullid in precursors' check.

obsolete: extract helpers from _load() In preparation for making the successors, precursors, and children dictionaries lazily populated, break up _load() into one function for adding markers to each dictionary.

test-gendoc: require gettext If the gettext utilities aren't installed, there is no way to make the translations. This causes the gettext client to fall back to the untranslated message, which triggers "** NOTHING TRANSLATED **" errors and a test failure.