templater: provide hint for multi-line templates with parse errors
Previously, we punted. Now we "rewrite" the template's newlines to r'\n' and
offset the hint appropriately.
Differential Revision: https://phab.mercurial-scm.org/D2609
@echo off
powershell -NoProfile -ExecutionPolicy unrestricted -Command "& '%~dp0\editmergeps.ps1' %*"