setup: user-friendly error message if Python headers are missing

test-keyword: ignore subject in notify hook mails Long tmpdir names caused truncation of subject anyway, and that made $TESTTMP replacement fail.

test-keyword: fix test glob to ACL/SELinux flag

test-notify: fix fix for line continuation in long mail header lines Continued lines can also start with space. Note that this hack also incorrectly patches the diff output.

import: don't strip '#' lines from patch descriptions (issue 2417) Previously no '# ' lines came through the parser. Now only the first '# ' lines are processed, from '# HG changeset patch' and to the first line not starting with '# '.

test-notify: stabilize output test-notify is made a bit more stable by stripping "all" folders away instead of just 3.

tests: reintroduce ":$HGPORT" in test output This reduces the number of patterns that must be adjusted when writing tests.

tests: remove the last traces of $HGTMP $HGTMP isn't needed - and if we need something like that then $TESTTMP is more appropriate.

tests: remove filtertmp.py and helpers.sh These nice starts ended up being replaced with globs.

tests: remove redundant globs Many globs now just match $TESTTMP and is no longer needed.