extdata: just use iterator to read lines one by one

extdata: ignore ambiguous identifier as well

templater: add experimental support for extdata This is minimal and non-controversial implementation of extdata() template function. Originally extdata sources were exposed to the keyword namespace, but I've changed it to a plain function for simplicity.

revset: add experimental support for extdata This is minimal and non-controversial implementation of extdata() revset. Originally extdata sources were exposed to the symbol namespace, but I've changed it to a plain function for simplicity.

extdata: add extdatasource reader This adds basic support for extdata, a way to add external data sources for revsets and templates. An extdata data source is simply a list of lines of the form: <revision identifier>[<space><freeform text>]\n An extdata source is configured thusly: [extdata] name = <a url or path> urls of the form shell: are launch shell commands to generate data. This patch is slightly modified by Yuya Nishihara as follows: - fix typo - remove unused function - remove future expansion point for parameter (which can be added later as the extdata revset/template are experimental) You can see the original patch at https://www.mercurial-scm.org/pipermail/mercurial-devel/2016-September/088426.html

tests: change to parent directory before all "hg init" in test-log.t Add a "cd .." before the second "hg init" so that all repositories are on top level of test directory. Makes inspection of test directory easier.

config: add a missing preparewrite() call Thanks Yuya for pointing this out in D808. Differential Revision: https://phab.mercurial-scm.org/D924