add explicit extension disabling syntax to hgrc.5

Permit XML entities to be escaped in template output. Useful for creating XML documents directly from Hg logging. Can also be used for HTML. For use in content, will escape '&', '<', and for completeness '>' (although it is not strictly necessary). For use in attributes, will also escape ' and ". Will also replace nonprinting (ASCII) control characters with spaces, since these are illegal in XML.

convert: add shallow, single branch svn conversions via svn.startrev

convert: allow svn trunk/branches/tags detection to be skipped - eluding convert.svn.branches defaults to "branches" - convert.svn.branches= disables branches detection - convert.svn.branches=/ is equivalent to former convert.svn.branches=

Add --all option to bundle command

Fix test-convert.out after 55455556f921

convert: improve subversion source documentation

hgweb: fix parameter mixup (issue1001)

tests: easier hg serve error diagnosis

util: make walkrepos() return .hg/patches if present