checkheads: attend to phases when computing new heads with obsolete
Checkheads was more permissive than expected. When the remote heads
are public we don't need to search for successors. None will make a
public head disappear.
test: add testing of checkheads behavior with obsolete
Expected behavior is quite complex. Explicit testing with clear
scenarios is welcome.
i18n-pt_BR: synchronized with
f5e86b416e05
tests: unset variable HG if it is set
When hg tries to call itself it can call a different hg executable when this
variable is set. Some tests fail when the called hg version is different.