cmdutil: fix bug in finddate() implementation

merge changes from mpm

cmdutil: update finddate() walkchangerevs() now returns contexts, does not take a cache func.

walkchangerevs: drop ui arg

walkchangerevs: reset cache between windows

log: tidy up some filter tests

walkchangerevs: move 'add' to callback Now walkchangerevs is a simple iterator over contexts

hgweb: added test case for extension loading phases (issue1824) this checks the order of module loading phases of hgweb. `4) reposetup' lines are duplicated because hgweb calls hg.repository() twice, one by __init__, another by refresh.

extensions: changed to call extsetup() from extensions.loadall() previously uisetup() was invoked by extensions.loadall(), but extsetup() was by _dispatch(). there's no need to split them because we have nothing to do between uisetup() and extsetup(). this fixes issue1824 indirectly.

hgrc.5.txt: mention hgrc categories with higher precedence first Reordering the FILES section accordingly. The previous ordering of categories might have been nice from the viewpoint of a site admin doing an initial install, but presenting a higher-precedence-first ordering is more relevant and natural for the average end user, since he will most likely resort to editing rc files in the order of their precedence, overriding whatever "sane" defaults are coming from more general files. Note that this patch does not change the texts, it just moves them. So, whatever bugs, grammar errors, or typos may have been in the texts before this patch: they are still there. On purpose. Because this patch here does not want to reword texts while moving them.